Public bug reported:

Problem
---------
If a theme without gtk-3-support is used, gtk-3-apps (evince, gedit etc.) are 
inusable: The scrollbars are ugly, parts of the UI for example tabs are black 
and one can hardly select any text.

If one changes the theme to one that doesn't support gtk3 it is obvious
where the problem is coming from and users can simply change the theme
back. But if a setup that doesn't use any gtk-3-apps and has a theme
without gtk-3-support is updated and the newer version of as app uses
gtk-3 it is very difficult to find out what's the problem.

Solution
---------
Things that should be changed:
*)
Mark themes not supporting gtk-3 in the theme-choser-dialogs

*)
Many themes are ported to support gtk-3. But the ported ones (that support 
gtk-2 and 3) are in different packages. The packages should be changed such 
that the ported ones replace the old ones. For example clearlooks-phenix-theme 
should replace clearlooks in gnome-themes-extra

Additionally one of the following schould also be done:
*)
Dependencies should be changed such that libgtk-3-0 is in conflict with all 
theme-packages that doesn't support gtk3

or

*)
The themes for gtk2 and gtk3 should get chosen seperately.

or

*)
There should be a usable fallback-gtk-3-theme that should automatically be used 
for gtk-3-apps if the chosen theme doesn't support gtk-3 itself.

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: evince gedit gtk3 tab theme

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https://bugs.launchpad.net/bugs/1111630

Title:
  GTK3-apps unusable with some themes

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