xfce4-panel don't show windows buttons with FlatSurfaces GTK3 theme
xfce4-panel with Flat Surfaces GTK3 theme don't show window buttons. How to reproduce:
- Install theme https://github.com/cat-in-136/FlatSurfacesTheme
- Close all windows (or restart the panel).
- Open any new window (terminal, editor, other). Window buttons don't appear in task bar.
There are many errors in file .xsession-errors:
(xfce4-panel:6642): libtasklist-CRITICAL **: 22:43:22.758: tasklist-widget.c:1155 (xfce_tasklist_size_allocate): expression 'area.height == tasklist->size' failed.
(xfce4-panel:6642): libtasklist-CRITICAL **: 22:43:26.314: tasklist-widget.c:1155 (xfce_tasklist_size_allocate): expression 'area.height == tasklist->size' failed.
(xfce4-panel:6642): libtasklist-CRITICAL **: 22:43:26.341: tasklist-widget.c:1155 (xfce_tasklist_size_allocate): expression 'area.height == tasklist->size' failed.
- xfce4-panel, tested versions: 4.16.5, 4.17.3.
- GTK3: 3.24.34
- Distr: Debian (testing).