this is general in Mate. Same on debian (stretch) matedesktop.
xdg-mime query default application/x-desktop
userapp-pluma-JPST30.desktop
this desktop file appears under $HOME/.local/share/applications/
cat .local/share/applications/userapp-pluma-JPST30.desktop
[Desktop Entry]
Encoding=UTF-8
V
** Changed in: mate-desktop
Status: Unknown => New
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https://bugs.launchpad.net/bugs/1929307
Title:
It is hard to set Pluma as default application to open desktop-files
To manage
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: caja (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1929307
Title:
It is
The weird thing is, after doing this, there is an additional "pluma" in
the Properties/Open With list. It appears that for some reason "Pluma"
is forbidden from being the default application to open these files
with, but you can get it to work with "pluma".
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