The WSI layer sends override_window_content on every present, and
gamescope walked the X tree to the top-level window (a blocking
XQueryTree round trip per level, under the wlserver lock) before
noticing the same swapchain already overrides it. A swapchain repeating
the same window now skips the walk for 100 ms (0121).
Backport of upstream gamescope 2962992 by Matthew Schwartz: the nested
Wayland backend's input thread reads the host display, but steamcompmgr
does not watch that fd, so buffer releases and presentation feedback
could wait up to one refresh for its next poll; the input thread now
wakes it after each read (0122).
Pins gamescope-3.16.29-p17, the archive that was A/B-tested on the
device. PATCHES.md also describes the p16 change to 0120.
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