Public bug reported:
to reproduce:
install gtk-3-examples on a system with software rendering, like virtualbox.
run gtk3-demo --run=glarea
observe black boxes.
I fixed it upstream with this commit:
https://gitlab.gnome.org/GNOME/gtk/-/commit/69334021a22a79f5fddb30f0872fcf3fc6bc1cf0
** Affects: gtk+3.0 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1894737
Title:
gtkglarea not working on software renderers
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