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I use the Breeze Dark theme on Kubuntu, which also works perfectly with GTK+2 applications, but it's not fully supported on GTK+3 applications like Firefox yet.

Because of that, I've set my system to use Breeze Dark for GTK+2 programs, and the light Breeze for GTK+3 programs.

However, the KDE settings window (GNOME Application Style) only lets me pick a single icon pack for both versions. Is it possible to use different icon sets for them? The "fallback theme" option doesn't work for that.

  • Please don't cross-post. If you want this moved to another site like [unix:se] then please flag your post. – phk Jun 29 '16 at 23:42
  • @phk I've got that post removed already. – user562675 Jul 2 '16 at 7:57
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I don't have KDE installed right now to test. As I remember with Kubuntu 15.04, KDE was creating two files to override GTK theme settings.

GTK2:

~/.gtkrc-2.0

GTK3:

~/.config/gtk-3.0/settings.ini

As they are two separate file you can change them differently. But you may need to change them to read-only so KDE config tool will not able to change them.

I could find a reference with example: Archlinux Wiki - GTK

Basic theme configuration

To manually change the GTK+ theme, icons, font and font size, add the following to the configuration files, for example:

GTK+ 2:

~/.gtkrc-2.0

gtk-icon-theme-name = "Adwaita"
gtk-theme-name = "Adwaita"
gtk-font-name = "DejaVu Sans 11"

GTK+ 3:

$XDG_CONFIG_HOME/gtk-3.0/settings.ini

[Settings]
gtk-icon-theme-name = Adwaita
gtk-theme-name = Adwaita
gtk-font-name = DejaVu Sans 11

Note: The icon theme name is the name defined in the theme's index file, not the name of its directory.

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