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f511f94aa2
I noticed my system would fall back to the slow unclipped (and uncullable) paint path whenever a window touched the left edge of the screen. Turns out that was a red herring. Just that `use_clipped_redraw` was uninitialized so clipping/culling was used randomly. So the compiler failed to notice `use_clipped_redraw` was uninitialized. Weirdly, as soon as you fix that it starts complaining that `buffer_age` might be uninitialized, which appears to be wrong. So we initialize that too, to shut up the compiler warnings/errors. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1323