[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=305136

Harald Sitter  changed:

   What|Removed |Added

  Latest Commit|https://invent.kde.org/plas |https://invent.kde.org/fram
   |ma/plasma-desktop/-/commit/ |eworks/kservice/-/commit/c3
   |dfca581a1fb934a1146286441cd |47606b240bfd1c65f46abd43e65
   |051981c50b673   |fffb1f18053

--- Comment #40 from Harald Sitter  ---
Git commit c347606b240bfd1c65f46abd43e65fffb1f18053 by Harald Sitter.
Committed on 14/02/2024 at 09:15.
Pushed by sitter into branch 'master'.

kservice: remove InitialPreference

Since this was a KDE specific feature it caused problems with
interoperability. Applications based on other XDG implementations would
entirely ignore it and by extension have a different idea of what
application should be used to open a given mimetype. Instead we now rely
only on the XDG provided facilities to manage preference. Specifically
plasma-desktop is meant to ship a kde-mimeapps.list that encodes the
Plasma default preferences and distributions are meant to ship
*mimeapps.list to encode sensible preferences beyond that.

M  +5-12   autotests/kmimeassociationstest.cpp
M  +10   -83   src/services/kservice.cpp
M  +0-29   src/services/kservice.h
M  +1-5src/services/kservice_p.h
M  +7-7src/services/kservicefactory.cpp
M  +1-1src/services/kservicefactory_p.h
M  +4-5src/sycoca/kbuildservicefactory.cpp
M  +1-1src/sycoca/ksycoca.cpp

https://invent.kde.org/frameworks/kservice/-/commit/c347606b240bfd1c65f46abd43e65fffb1f18053

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=305136

Nate Graham  changed:

   What|Removed |Added

   Version Fixed In||6.0

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=305136

Harald Sitter  changed:

   What|Removed |Added

  Latest Commit|https://invent.kde.org/plas |https://invent.kde.org/plas
   |ma/plasma-desktop/-/commit/ |ma/plasma-desktop/-/commit/
   |89c68cd74ee439adf1ac8526b3e |dfca581a1fb934a1146286441cd
   |3780894c3157f   |051981c50b673

--- Comment #39 from Harald Sitter  ---
Git commit dfca581a1fb934a1146286441cd051981c50b673 by Harald Sitter.
Committed on 13/02/2024 at 11:12.
Pushed by sitter into branch 'Plasma/6.0'.

install a kde-mimeapps.list

introducing a mimeapps.list has a number of advantages

- formalized encoding of default choices based on xdg tech
- non-kde apps will also respect this when inside a plasma session
- it paves the way to drop our initialpreference tech which has various
problems in a world where applications use any number of different xdg
implementations of which not all will be privy to the initialpreference

the list of defaults is seeded from the componentchooser kcm, plus
discover defaults used in neon already

(this file is part of plasma-desktop since mobile choices may be
divergent, making it a bad fit for plasma-workspace)


(cherry picked from commit 89c68cd74ee439adf1ac8526b3e3780894c3157f)

M  +1-0CMakeLists.txt
A  +152  -0kde-mimeapps.list

https://invent.kde.org/plasma/plasma-desktop/-/commit/dfca581a1fb934a1146286441cd051981c50b673

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=305136

Harald Sitter  changed:

   What|Removed |Added

  Latest Commit||https://invent.kde.org/plas
   ||ma/plasma-desktop/-/commit/
   ||89c68cd74ee439adf1ac8526b3e
   ||3780894c3157f
 Status|ASSIGNED|RESOLVED
 Resolution|--- |FIXED

--- Comment #38 from Harald Sitter  ---
Git commit 89c68cd74ee439adf1ac8526b3e3780894c3157f by Harald Sitter.
Committed on 13/02/2024 at 10:46.
Pushed by sitter into branch 'master'.

install a kde-mimeapps.list

introducing a mimeapps.list has a number of advantages

- formalized encoding of default choices based on xdg tech
- non-kde apps will also respect this when inside a plasma session
- it paves the way to drop our initialpreference tech which has various
problems in a world where applications use any number of different xdg
implementations of which not all will be privy to the initialpreference

the list of defaults is seeded from the componentchooser kcm, plus
discover defaults used in neon already

(this file is part of plasma-desktop since mobile choices may be
divergent, making it a bad fit for plasma-workspace)

M  +1-0CMakeLists.txt
A  +152  -0kde-mimeapps.list

https://invent.kde.org/plasma/plasma-desktop/-/commit/89c68cd74ee439adf1ac8526b3e3780894c3157f

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #37 from Bug Janitor Service  ---
A possibly relevant merge request was started @
https://invent.kde.org/frameworks/kservice/-/merge_requests/181

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #36 from Bug Janitor Service  ---
A possibly relevant merge request was started @
https://invent.kde.org/frameworks/kservice/-/merge_requests/179

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Bug Janitor Service]

https://bugs.kde.org/show_bug.cgi?id=305136

Bug Janitor Service  changed:

   What|Removed |Added

 Status|CONFIRMED   |ASSIGNED

--- Comment #35 from Bug Janitor Service  ---
A possibly relevant merge request was started @
https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/2030

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Ilya Fedin]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #34 from Ilya Fedin  ---
portal uses glib, not the KDE associations. IMO, KDE should really get rid of
non-standardized additions, all other implementations don't support them.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Pols12]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #33 from Pols12  ---
(In reply to mcarans from comment #32)
> I forgot to add that KDE itself opens the correct application. It is Firefox
> that opened the wrong one.

I know, but KDE gets default associations from KSycoca, so you need to force it
to edit mimeapps.list with the method I gave (or to manually edit the file).
However, if you have found a workaround, that’s it.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[mcarans]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #32 from mcarans  ---
(In reply to Pols12 from comment #31)
> (In reply to mcarans from comment #30)
> > What should I change to make the correct application open when I double 
> > click deb in the
> > Firefox download manager? I have a file 
> > /usr/share/applications/defaults.list in my distro
> > (Kubuntu) if that's any help.
> 
> If I remember correctly, KDE well edits `$HOME/.config/mimeapps.list` when
> you customize your file associations. So, from ComponentChooser or from
> Dolphin, change the default application for .deb, then change back to your
> wanted application. I think that will solve your issue.

I forgot to add that KDE itself opens the correct application. It is Firefox
that opened the wrong one. However, I was alerted on r/kde to the Firefox
config settings: widget.use-xdg-desktop-portal* which if all set to 1 force the
use of portal and hence KDE associations.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Pols12]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #31 from Pols12  ---
(In reply to mcarans from comment #30)
> What should I change to make the correct application open when I double click 
> deb in the
> Firefox download manager? I have a file /usr/share/applications/defaults.list 
> in my distro
> (Kubuntu) if that's any help.

If I remember correctly, KDE well edits `$HOME/.config/mimeapps.list` when you
customize your file associations. So, from ComponentChooser or from Dolphin,
change the default application for .deb, then change back to your wanted
application. I think that will solve your issue.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[mcarans]

https://bugs.kde.org/show_bug.cgi?id=305136

mcarans  changed:

   What|Removed |Added

 CC||mcar...@yahoo.co.uk

--- Comment #30 from mcarans  ---
(In reply to David Faure from comment #27)
> The idea was that it's fine for Gnome to ignore our InitialPreference and
> it's fine for KDE to ignore Gnome's global file, since we want different
> defaults. But Gnome's global file was supposed to be called
> gnome-mimeapps.list, not defaults.list.

I find that double clicking a deb file in the Firefox download manager opens
Ark.  I understand from this Firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1304650 that Firefox uses
g_app_info_get_default_for_type to work out what to open. What should I change
to make the correct application open when I double click deb in the Firefox
download manager? I have a file /usr/share/applications/defaults.list in my
distro (Kubuntu) if that's any help.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Sam James]

https://bugs.kde.org/show_bug.cgi?id=305136

Sam James  changed:

   What|Removed |Added

 CC||s...@gentoo.org

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[David Redondo]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #29 from David Redondo  ---
> The idea was that it's fine for Gnome to ignore our InitialPreference and 
> it's fine for KDE to ignore Gnome's global file, since we want different 
> defaults.

Yes but glib applications inside plasma will still open the "wrong" application
since glib can't know InitialPreference. We would either need to generate a
kde-mimeapps.list that respects the order or maybe more elegant teach
update-desktop-database InitialPreference so in mimeinfo.cache the order is
what we (KDE) expect and not alphabetically.

> But Gnome's global file was supposed to be called gnome-mimeapps.list, not 
> defaults.list.

The seem to carry it has deprecated for backwards compat
https://gitlab.gnome.org/GNOME/glib/-/blob/main/gio/gdesktopappinfo.c#L1021
Maybe it could only be read in GNOME session guarded by an env var.

>Isn't it the distro's fault of providing the legacy file?

Yes. It illustrates that it is a hard problem with non-standard from both
sides.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Ilya Fedin]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #28 from Ilya Fedin  ---
Isn't it the distro's fault of providing the legacy file?

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[David Faure]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #27 from David Faure  ---
The idea was that it's fine for Gnome to ignore our InitialPreference and it's
fine for KDE to ignore Gnome's global file, since we want different defaults.
But Gnome's global file was supposed to be called gnome-mimeapps.list, not
defaults.list.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[David Redondo]

https://bugs.kde.org/show_bug.cgi?id=305136

David Redondo  changed:

   What|Removed |Added

 CC||k...@david-redondo.de

--- Comment #26 from David Redondo  ---
I investigated this because Firefox was choosing gedit for plain/text instead
of kate. 

For me the problem was not that we do not provide or generate a default
mimeapps list or a that GLib is not following our 'InitialPreference' but my
distro was providing a 

/usr/share/applications/defaults.list

file which sets gedit as default. This file is not in the spec but something
histotical and glib specific. With this file removed firefox correctly chooses
kate .

So there are two issues that we have a non-standard key that gio doesn't
support and gio has a non-standard file that we do not know about.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=305136

Nate Graham  changed:

   What|Removed |Added

   Priority|NOR |HI

--- Comment #25 from Nate Graham  ---
Seems sane!

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #24 from postix  ---
Nate, would you mind to make this bug to the "15-minute bug initiative"? It's
something one can very quickly discover when using a GTK application and it's
very annoying. :)

Until it's solved for everyone, this should work:

```
$ cat /usr/share/applications/mimeapps.list
[Added Associations]

[Default Applications]
image/gif=org.kde.gwenview.desktop;
image/jpeg=org.kde.gwenview.desktop;
image/png=org.kde.gwenview.desktop;
image/webp=org.kde.gwenview.desktop;

[Removed Associations]
application/pdf=chromium.desktop;claws-mail.desktop;
application/rdf+xml=chromium.desktop;
application/rss+xml=chromium.desktop;
application/xhtml+xml=chromium.desktop;
application/xhtml_xml=chromium.desktop;
application/xml=chromium.desktop;
image/gif=chromium.desktop;
image/jpeg=chromium.desktop;
image/png=chromium.desktop;
image/webp=chromium.desktop;
text/html=chromium.desktop;
text/xml=chromium.desktop;
x-scheme-handler/http=chromium.desktop;
x-scheme-handler/https=chromium.desktop;
```

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Celeste Liu]

https://bugs.kde.org/show_bug.cgi?id=305136

Celeste Liu  changed:

   What|Removed |Added

 CC||coelacanthus...@gmail.com

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305136

prettyvani...@posteo.at changed:

   What|Removed |Added

 CC||prettyvani...@posteo.at

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305136

gudvinr+...@gmail.com changed:

   What|Removed |Added

 CC||gudvinr+...@gmail.com

--- Comment #23 from gudvinr+...@gmail.com ---
https://bugzilla.mozilla.org/show_bug.cgi?id=1304650

Relevant Firefox issue

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[nyanpasu64]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #22 from nyanpasu64  ---
One detail I failed to realize or mention earlier, is that in GTK file managers
like Thunar (and probably Nautilus), opening a file in a particular app (even
without setting it as default) actually sets a "soft" default file association
by reordering the file format's entry in mimeapps.list [Added Associations].
For example, if you open Thunar, right-click a .zip file, and pick Open With ->
Open With "Archive Manager" (or pick "Open With Other Application..." and in
the dialog *don't* check "Use as default for this kind of file"), then
~/.config/mimeapps.list [Added Associations] gets a new entry
`application/zip=org.gnome.FileRoller.desktop;...`, where org.gnome.FileRoller
(Archive Manager) comes first. I think this is accomplished through
g_app_info_set_as_last_used_for_type()
(https://docs.gtk.org/gio/method.AppInfo.set_as_last_used_for_type.html ->
g_desktop_app_info_set_as_last_used_for_type
https://gitlab.gnome.org/GNOME/glib/-/blob/62a9a8a660fadf2355342b1d95c539432c666fe1/gio/gdesktopappinfo.c#L3865).
KDE/Qt's Dolphin respects the "soft" default association from [Added
Associations], but does not set [Added Associations] when you open a file in an
app.

In Thunar, if you open properties of a .zip file and set a default *there*,
then a [Default Applications] entry gets created (probably
g_app_info_set_as_default_for_type()
https://docs.gtk.org/gio/method.AppInfo.set_as_default_for_type.html). At this
point, Thunar's "Open With" menu still reorders the format's entry in [Added
Associations], but the order's first entry is ignored in favor of the
association in [Default Applications].

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps due to lack of /usr/share/applications/kde-mimeapps.list file installed by default

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=305136

Nate Graham  changed:

   What|Removed |Added

Summary|File associations are   |File associations are
   |broken in gtk/glib apps |broken in gtk/glib apps due
   ||to lack of
   ||/usr/share/applications/kde
   ||-mimeapps.list file
   ||installed by default

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=305136

Nate Graham  changed:

   What|Removed |Added

 CC||daethed...@gmail.com

--- Comment #21 from Nate Graham  ---
*** Bug 449234 has been marked as a duplicate of this bug. ***

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Ilya Fedin]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #20 from Ilya Fedin  ---
KCM will do something only when changing the settings, yeah? It already does
that afaik. The problem is with the default associations. KDE uses custom
InitialPreference key in desktop files while it should provide
/usr/share/applications/kde-mimeapps.list with all default preferences instead
to be compliant with the XDG spec.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #19 from Nate Graham  ---
> Meanwhile if you like KDE's defaults and want them applied to non KDE apps, 
> the solution is to generate a mimeapps.list file.
Could we have the KCM do that automatically? Either automatically, or
optionally?

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Pols12]

https://bugs.kde.org/show_bug.cgi?id=305136

Pols12  changed:

   What|Removed |Added

 CC||poltro...@gmail.com

--- Comment #18 from Pols12  ---
(In reply to David Faure from comment #14)
> Meanwhile if you like KDE's defaults and want them applied to non KDE apps,
> the solution is to generate a mimeapps.list file.

This is required to comply with Freedesktop.org Mime Apps Spec: default KDE
setup should include `/user/share/applications/mimeapps.list`.

https://specifications.freedesktop.org/mime-apps-spec/latest/ar01s02.html

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Ilya Fedin]

https://bugs.kde.org/show_bug.cgi?id=305136

Ilya Fedin  changed:

   What|Removed |Added

 CC||fedin-ilja2...@ya.ru

--- Comment #17 from Ilya Fedin  ---
According to
https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-latest.html#file,
there's $XDG_DATA_DIRS/applications/$desktop-mimeapps.list, so why not to
provide a kde-mimeapps.list with all the preferred applications by default
instead of using a non-standard key? That should work for any XDG-compilant
library and have effect only with XDG_CURRENT_DESKTOP=KDE

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Nicolas Fella]

https://bugs.kde.org/show_bug.cgi?id=305136

Nicolas Fella  changed:

   What|Removed |Added

 CC||nicolas.fe...@gmx.de

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=305136

k...@trummer.xyz changed:

   What|Removed |Added

 Status|REPORTED|CONFIRMED
 Ever confirmed|0   |1

--- Comment #16 from k...@trummer.xyz ---
*** This bug has been confirmed by popular vote. ***

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #15 from postix  ---
(In reply to David Faure from comment #14)
> This hasn't resulted in a spec though, partly due to inaction on my side. 
> Meanwhile (...)
Thank you for discussing it with the XDG people! It would be great if you keep
on it to turn it into a spec eventually. :)

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[David Faure]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #14 from David Faure  ---
> EXPECTED RESULT
> In a desktop configured by KDE, gio mime should match file associations in KDE
> apps, and have reasonable defaults.

I failed to convince people about InitialPreference on the x...@freedesktop.org
mailing-list. The conclusion was more along the lines of "in the absence of a
saved preference, ask the user and write out the result in mimeapps.list" --
and also some improvements to the defaults by separating native mimetypes from
other supported mimetypes. This hasn't resulted in a spec though, partly due to
inaction on my side.

Meanwhile if you like KDE's defaults and want them applied to non KDE apps, the
solution is to generate a mimeapps.list file.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[nyanpasu64]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #13 from nyanpasu64  ---
Decided to install GNOME to see how it handles default applications. I had a
lot less "mishmash of broken settings and broken default applications" this
time around, compared to my last attempt at multiple DEs.

GNOME has a "Default Applications" settings page. It works by writing dozens of
file associations into ~/.config/mimeapps.list (this file applies to all DEs).
If you set VLC as your default audio player, GNOME will first set
"audio/x-vorbis+ogg" to launch VLC by default, then set every MIME type
supported by VLC matching "audio/*" to launch VLC by default (skipping VLC's
video MIME types, and audio/* MIME types that VLC doesn't support). This is a
useful tool to set default apps (though it doesn't have the option to exclude
specific file types from being assigned to your new default app, which is
sometimes useful). Unfortunately KDE has no equivalent convenient tool to
change MIME types. Fortunately gnome-control-center also changes default apps
in KDE, though it might come with a lot of GNOME dependencies (not sure).

In summary, GNOME doesn't follow InitialPreference like KDE does, resulting in
suboptimal file associations. However GNOME makes it easy (unlike in KDE) for
each user to set entire categories of MIME types to a single default app. (IDK
if GNOME updates your account-local mimeapps.list's [Added Associations] or
[Default Applications] when you install or uninstall apps.) So merely
installing GNOME and setting default apps once is enough to fix file
associations globally in all DEs, for as long as you use the same computer and
user account. (There's a *lot* more depth including bugs where GNOME mixes up
MIME aliases, but I don't know where to publish my writeup or whether to file a
bug report.)

I don't know if GNOME defaults to something dumb (like Wine Internet Explorer)
for PDF files by default though, requiring manual fixing for each filetype
(which is worse than KDE using good defaults out of the box).

I still don't know the best route to take from now on, whether to convince
GNOME to support InitialPreference, to write my own converter from
InitialPreference to mimeapps.list, or from InitialPreference to mimeinfo.cache
(replacing update-desktop-database).



Also, I think KDE needs an equivalent to GNOME's "Default Applications"
settings page. (There's an old closed bug at
https://bugs.kde.org/show_bug.cgi?id=211147, mentioning default images/videos
which can be implemented like GNOME, but also default office suites which is
more complex.)

KDE Default Applications's current architecture is located at
https://invent.kde.org/plasma/plasma-desktop/-/tree/master/kcms/componentchooser.
It uses one C++ class per item (eg. the default browser is controlled by
componentchooserbrowser.h/cpp) and hard-codes the logic used for each item. It
currently lacks any items which use globs to change many MIME types in bulk.
One way to rewrite it is in a more data-driven approach like GNOME's at
https://gitlab.gnome.org/GNOME/gnome-control-center/-/blob/6c816e79e83383c11a07ab6a734cd8350c6c330e/panels/default-apps/cc-default-apps-panel.c#L27-35.
However I don't know if doing so would lose out on functionality currently
unique to each C++ class, like ComponentChooserBrowser using a BrowserSettings
object.

It seems that KDE Default Applications (at least "Web browser" and "File
manager") also applies to other desktop environments, but I haven't researched
how/why.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[nyanpasu64]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #12 from nyanpasu64  ---
To my knowledge, GNOME determines file associations through a standard XDG
lookup; it's technically performed using VFS, but I don't think it matters for
KDE trying to write default apps. GTK's "Default Applications" settings dialog
uses g_app_info_get_recommended_for_type and g_app_info_get_default_for_type to
fetch the current default app, and g_app_info_set_as_default_for_type to set a
default app. And editing ~/.config/mimeapps.list is necessary and sufficient to
change GNOME's default apps in both Files and Default Applications.

Caveats:

- I haven't looked into how `gio mime` sets associations, but I assume it works
the same way.
- Apparently g_app_info_get/set...()
(https://developer.gnome.org/gio/stable/GAppInfo.html) are actually implemented
in terms of the GIO VFS API. However I've only seen them query the various
mimeapps.list/mimeinfo.cache files, never any virtualized apps. I don't know if
it's necessary for KDE to shell out to these APIs; I was planning to just write
tools that interface with the standard XDG MIME/application files.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

postix  changed:

   What|Removed |Added

Version|4.8.4   |5.21.90
   Platform|Gentoo Packages |unspecified

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #11 from postix  ---
Since `gio mime image/jpeg org.kde.gwenview.desktop` works fine for me amd
persists even after restarts and system upgrades, my guess would be, that it'd
be sufficient if Plasma uses the GIO  VFS API [1] to set the desired mimetype
associations Gnome/GTK apps.

[1] https://developer.gnome.org/gio/stable/ch01.html

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

postix  changed:

   What|Removed |Added

   Keywords||accessibility, usability

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

postix  changed:

   What|Removed |Added

 CC||n...@kde.org

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[postix]

https://bugs.kde.org/show_bug.cgi?id=305136

postix  changed:

   What|Removed |Added

 CC||pos...@posteo.eu

--- Comment #10 from postix  ---
*** Bug 436407 has been marked as a duplicate of this bug. ***

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[nyanpasu64]

https://bugs.kde.org/show_bug.cgi?id=305136

nyanpasu64  changed:

   What|Removed |Added

 CC||nyanpas...@tuta.io

--- Comment #9 from nyanpasu64  ---
I was planning to file this bug myself, but found this bug report, so I'll post
my investigation here.

SUMMARY
When using GTK apps like Firefox in a KDE desktop, files open in the wrong apps
compared to in KDE.

STEPS TO REPRODUCE
1. Install KDE on a Linux distro.
2. xdg-mime query default image/png
3. gio mime image/png

OBSERVED RESULT
xdg-mime (delegating to ktraderclient5) matches file associations in Qt/KDE
apps, and picks reasonable default apps (based on the InitialPreference values
in .desktop files).

gio mime matches file associations in GTK apps or Firefox, and picks
unreasonable default apps, like opening images in gimp.desktop or
okularApplication_kimgio.desktop instead of org.kde.gwenview.desktop. (This is
approximately alphabetically sorted, and matches the order in
/usr/share/applications/mimeinfo.cache.)

EXPECTED RESULT
In a desktop configured by KDE, gio mime should match file associations in KDE
apps, and have reasonable defaults.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.21.90
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.7-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 730/PCIe/SSE2

ADDITIONAL INFORMATION
This issue was already analyzed 7 years ago in the Firefox bug tracker, at
https://bugzilla.mozilla.org/show_bug.cgi?id=727422#c24.

To summarize/elaborate, KDE extends the .desktop file spec with KDE-specific
keys. For example, apps can specify InitialPreference (a default priority)
which KDE (and only KDE to my knowledge) uses to pick default apps, if the user
doesn't override the order through ~/.config/mimeapps.list (or
/etc/xdg/mimeapps.list or /usr/share/mime/mimeapps.list). As a result, when
opening files in KDE, KDE apps (the only ones to specify InitialPreference) are
picked first ahead of other apps by default. For example,
/usr/share/applications/org.kde.gwenview.desktop has InitialPreference=8. GNOME
apps (which use glib's g_app_info_get_all_for_type/etc.) do not use these
priorities, so opening downloaded files in Firefox defaults to mimeinfo.cache
(which is usually in alphabetical order, which is not what you generally want).

I think KDE should export the InitialPreference values to mimeapps.list. But
the exact design involves multiple decisions that trade-off between multiple
desired/undesired properties. One decision is choosing whether to install to
/usr/share/applications/ (overriden by /etc/xdg/mimeapps.list) or ~/.config/
(can't be overriden except by per-user config). Another is how to handle
mismatches between the .desktop files and mimeapps.list; we need to handle both
adding/removing applications or packages changing InitialPreference, and the
user editing mimeapps.list (though perhaps users shouldn't be editing
/usr/share/applications/ when /etc/xdg/ is a cleaner way to override it?). Yet
another is choosing whether to write mimeapps.list or KDE-mimeapps.list.

/etc/xdg/mimeapps.list seems to work on both GNOME and KDE. However I ran into
some roadblocks while setting it up. I tried copying my own mimeapps.list to
/etc/xdg/mimeapps.list (then renaming my own to deactivate it), but forgot to
`chmod 644 /etc/xdg/mimeapps.list` before testing MIME lookup. Apparently KDE
apparently "cached" that that file was inaccessible, and didn't use it even
after I ran `chmod 644 /etc/xdg/mimeapps.list` and `update-desktop-database
/etc/xdg`, until I deleted and recreated mimeapps.list.

An alternative to exporting preferences to mimeapps.list (which can be read by
update-desktop-database) is extending or rewriting update-desktop-database to
use InitialPreference values when generating mimeinfo.cache files.

Yet another alternative is to tell glib to add support for InitialPreference
values ;). Though I don't know how GNOME supports default apps, or reordering
apps system-wide or on a per-user level (I assume per-user reordering is done
through ~/.config/mimeapps.list). Does GNOME allow setting one app above
another for *every* file that both can handle? I wish KDE allowed for that, but
I don't think it's possible without editing /usr/share/applications/ and hoping
it doesn't get overwritten in a package update.

I'm going to be experimenting with writing a daemon or tool of my own, to test
various approaches to generating mimeapps.list or mimeinfo.cache. If anyone is
interested in my efforts, or wants to do something similar "officially" in the
KDE or XDG projects, let me know!

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Dr . Chapatin]

https://bugs.kde.org/show_bug.cgi?id=305136

Dr. Chapatin  changed:

   What|Removed |Added

 CC||bugsefor...@gmx.com

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[aditsu]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #8 from aditsu  ---
(In reply to David Faure from comment #6)
> Firefox isn't a GTK/glib application (AFAIK)

If Firefox somehow isn't a GTK/glib application (really?!), it certainly looks
and acts like one, and the file associations seem to be affected in the same
way by the same config files.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Mahendra Tallur]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #7 from Mahendra Tallur  ---
@David Faure : this is definitely what I was thinking too at first (FF bug -
not real GTK apps). However what rang me a bell is the fact they do behave
properly if the associations order is modified / saved again in the KDE control
center. Unrelated ?
Cheers !

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[David Faure]

https://bugs.kde.org/show_bug.cgi?id=305136

--- Comment #6 from David Faure  ---
Mahendra: you seem to be describing a Firefox bug. That's not anything we can
do anything about in the KDE community, please report that to the Firefox
developers. And since Firefox isn't a GTK/glib application (AFAIK), it's not
even related to this bug report.

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[systemsettings] [Bug 305136] File associations are broken in gtk/glib apps

[Mahendra Tallur]

https://bugs.kde.org/show_bug.cgi?id=305136

Mahendra Tallur  changed:

   What|Removed |Added

 CC||ma...@free.fr

--- Comment #5 from Mahendra Tallur  ---
Hi ! I noticed a strange behavior regarding files associations, that only
affect some GTK apps like Firefox / Thunderbird. I may file another bugreport
if necessary.

How to reproduce :
1) install a clean KDE Neon distribution (or Manjaro KDE, same behavior).
Plasma 5.12.1.
2) install wine
3) check the files associations for PNG and JPEG images in the KDE settings :
gwenview is first, wineserver is second
4) try to open a PNG or JPG in Dolphin : Gwenview is indeed invoked
5) try to open a PNG or JPG in Firefox : wineserver is invoked !!

WORKAROUND

6) go back to the files associations preferences, move some items back and
forth in the PNG / JPG lists ; save them
7) now, Gwenview will be invoked in Firefox, even though the list appears to be
the same ! Gwenview is indeed displayed as "default" in the FF/TB preferences
(while it was wineserver before)

SO : the KDE files associations list IS taken into account by Firefox /
Thunderbird BUT it has to be modified / saved first for some unknown reasons.

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