Live foreground output with background colors or in-place rewrites
requested a synchronous xterm row repair after every write, on top of
the dirty-row frame xterm had already queued while parsing. Busy
OpenCode frames all carry background SGR, so DOM panes painted each
frame twice.
The synchronous repair exists for Windows ConPTY DOM rendering. Keep it
there and let other platforms merge the repair into xterm's queued
frame. Replay and snapshot refresh policy is unchanged.
Drop tests that only asserted the private synchronous refresh call.
Fixes#22458
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
NeilandCopilot
8ceea00464