black backgrounds with CSD apps if turning the compositor off

[raveit65]

marco displays a black background behind CSD applications if turning the compositor off.
This is reproducable since windows-frame (csd) settings are enable in traditional themes.
mate-desktop/mate-themes@190c119
If you restart the client-side-decoration application the black background is gone.
But it sounds uggly to me to tell the users 'please restart your app'.
In other themes, ie. menta themes, i've disable csd theming to avoid that bad experience.

It's possible that it also happens with mate-panel menu in a GTK3 enviroment.
In the beginning of GTK3-3.14 the issue has occurred also with other applications in other desktops (xfce), ie. nm-applet menu, but this is now fixed by GTK3 itself.
It seems that marco ignore some hints for client-side-decorations and maybe it has the same reason than #163 .

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[raveit65]

PS: this is independent from marco version, here it is 1.8.x

[dnk]

this is gtk-3 bug, not marco's.
CSD uses additional space to render shadow. Shadow became black when compositor is disabled.
only gtk-3 (as CSD owner) can invalidate shadow.

[infirit]

https://bugzilla.gnome.org/show_bug.cgi?id=729767

[raveit65]

so, someone should file out a bug against gtk+
I would do that but my knowledge in C is zero, for dicussing this with gtk guys.
@infirit
closing this is not very helpful...
without to solve the issue it is imposible to support csd apps and i won't enable this settings in themes.

[infirit]

The bug is in Gtk. We can not fix this as all of this is drawn by gtk.

[raveit65]

This issue affects also all menus. Her e pannel-menus with GreenLaguna

Reason for that is is the GTK3 widget selector csd.popup is bundled to GTkMenuItem
You see that with gtk3-inspector.

Disabling csd.popup settings in themes is not a solution because this disables the shadow for all menus if compositor is on.
Note, this affects all gtk3 apps if the run in mate-session.
I know this is a bug in gtk3, but ignoring that is not a solution.