[Bug 1572043] [NEW] Gtk apps un-resizable and without decoration after upgrade to Wily in KDE/Gnome

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After upgrading from Kubuntu 15.04 to 15.10 window decorations on Gtk
apps are missing, which makes it impossible to resize them.

This happens under the Plasma (KDE) desktop and the Gnome desktop, but
not under the Ubuntu (Unity) desktop. In Unity the window has drop
shadows and is resizable by grabbing the shadow with the mouse, I guess
the Unity window manager creates them.

This also happens on a freshly created user account, so it is not a
problem with my existing user profile.

The missing borders are specified in the default
~/.config/gtk-3.0/gtk.css, but that is IMO wrong for KDE and Gnome.
Changing it to have non-zero borders makes the borders usable again
(though also ugly).

Another workaround is using ALT+right click to resize the window, (but
that is disabled by default under Gnome).


This problem seems to be related to the one as discussed at https://github.com/numixproject/numix-gtk-theme/issues/206, which also describes how to edit ~/.config/gtk-3.0/gtk.css to make the window borders visible again.

System: Ubuntu 15.10
libgtk-3-common 3.16.7-0ubuntu3; numix-gtk-theme 2.0.2-0ubuntu1

** Affects: kwin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Gtk apps un-resizable and without decoration after upgrade to Wily in KDE/Gnome
https://bugs.launchpad.net/bugs/1572043
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