The compositor already walked a surface table, but nothing had ever run
two clients at once, so "it composites" rested on a single rectangle.
schcom-test now starts two overlapping clients and checks the overlap
region from the host: the later surface has to win there. A compositor
that cannot order two surfaces cannot host a window manager, and that is
the property SchWM will be built on.
Two bugs in the test itself, both of which would have read as compositor
faults:
- it waited for the first "committed" line and screenshotted then, so
the second client had not drawn yet. It waits for both now.
- one probe point sat at 400,300 -- dead centre of an 800x600 screen,
which is exactly where the pointer is drawn. Moved clear of it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
181c420f21