The background-size interactive test includes a test-case which uses the
ClutterActor::paint signal to hijack the painting of the actor. We're
removing that signal from Clutter, so remove that signal handler and
paint the outer border unconditionally to mark the boundaries of the
widget (the outer border actually never worked to force the cairo/cogl
path). To fix the test, change it to not paint a border on the inner
container in the useCairo=false case, which should make sure the cogl
path gets used.
Also remove the useless useCairo argument from addTestLine().
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1479
Mutter and Clutter was changed to pass around the current target
framebuffer via the paint context instead of via the deprecated Cogl
framebuffer stack.
The framebuffer stack has also been removed from Cogl so change to use
the one in the paint context instead.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/827
Implement the background-size CSS property, specified by the CSS
Backgrounds and Borders Module Level 3, including the keywords
"contain", "cover", and fixed-size backgrounds.
https://bugzilla.gnome.org/show_bug.cgi?id=633462
