I also tried a few things. First, as far as I understood, parent-
relative background is not set with NULL, there is a special pattern
that should be used instead:
--- a/xfce4-panel/plugins/systray/systray-socket.c
+++ b/xfce4-panel/plugins/systray/systray-socket.c
@@ -139,7 +139,7 @@ systray_socket_realize (GtkWidget *widget)
else if (gtk_widget_get_visual (widget) ==
gdk_window_get_visual (gdk_window_get_parent (window)))
{
- gdk_window_set_background_pattern (window, NULL);
+ gdk_window_set_background_pattern (window,
gdk_x11_get_parent_relative_pattern());
socket->parent_relative_bg = TRUE;
}
This alone, of course, does not help, since the visuals of the window
and its parent are different: systray manager uses 24-bit visual on my
system, but all its parents, including the pannel and the plugin wrapper
("wrapper-2.0" window) use 32-bit RGBA visuals. I've hacked
systray_manager_set_visual function to use RGBA visual, too (what
gdk_screen_get_rgba_visual(screen) returns, if that's not NULL) -- and I
believe this is the right thing to do -- but it confuses
systray_socket_new which sees that the visual supports alpha channel and
thinks we have compositing.
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https://bugs.launchpad.net/bugs/1797417
Title:
Background of system tray icons not drawn properly
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