Pekka Paalanen d7c9042c78 renderer/native: state consistency in copy_shared_framebuffer_gpu
To mirror what happens in meta_onscreen_native_swap_buffers_with_damage(), warn
here too if next_fb is not NULL. This makes it clear to the reader of what the
expectations are inside this function.

Ensuring next_fb is NULL as the first thing in the function will make all error
paths equal: no longer some failures reset next_fb while others don't. Removing
such special cases should reduce surprises.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/810
2020-01-16 20:19:29 +00:00
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