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The overlay scrollbar module forces the window that should be scrolled
to be native. Gtk is moving away from native windows and seems to have
some hard-to-find regressions when using them.
This causes a bunch of themeing issues (black/transparent backgrounds)
which can be worked around in the theme by setting backgrounds for these
widgets explicitely. That's a performance issue (since we're filling
backgrounds unnecessarily) and annoying, as these have to be only some
of the time for some widgets (e.g., GtkEventBox).
Porting overlay-scrollbars to not use native windows might be worthwhile
if we decide to keep them.
** Affects: overlay-scrollbar (Ubuntu)
Importance: Undecided
Status: New
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Themes using overlay scrollbars have to set explicitly set backgrounds on all
scrollable widgets
https://bugs.launchpad.net/bugs/1367764
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