Created attachment 3717 patch and screenshot of the dialog It would be nice to have a color scheme tab in xfce4-appearance-settings, like in gnome (2). I've implemented this using the package xfce4-settings-4.8.0 as base. It has almost all the functions, but has some minor problems: - lacks translations - doesn't read the gtk_color_scheme string from the current selected theme - the "reset to default" button doesn't work like expected (it deletes the color_scheme string, but doesn't apply changes to the widgets untill relogin). - text labels of the color are not aligned in a good way (see attached screenshot). - a color scheme change doesn't affect xfwm4 (until relogin or change of xfwm4 theme). P.S.: to store the color_scheme string in xml i had to use g_strcompress() in any G_TYPE_STRING property in registry.c, i don't know if this could impact in other properties.
Created attachment 3720 Patch from tarball
Created attachment 3721 Image from tarball
I don't see the advantage of this.
With Gtk3 being in the mix now, this has become a lot more complicated and will likely end up in a big hack. There are some DE-independent tools you can use to achieve the desired result though, like https://github.com/satya164/gtk-theme-config