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[GNOME 40] clutter/frame-clock: Apply error diffusion (dithering) to dispatch times

Daniel van Vugt requested to merge vanvugt/mutter:frame-clock-error-diffusion-gnome-40 into gnome-40

But only the dispatch times used when last_presentation_time_us == 0 (Nvidia + Xorg).

This ensures the average dispatch interval is always precisely equal to the refresh interval, regardless of any jitter in the mainloop.

Fixes: #1751 (closed), #1758 (closed), #1870 (closed)

This is a backport of !1826 (merged) to gnome-40

Edited by Robert Mader

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