Skipped stdout draining after ProcessTerminal observes a native Windows terminal disconnect, while preserving normal postmortem cleanup and drain behavior for every other shutdown path.
Fixes#6917
(cherry picked from commit b45fc00ab4b5075ccb9650584947dde061beea20)
The mode 2048 in-band resize spec permits `:`-separated subparameters
on any field and requires clients to ignore them. The parser rejected
such reports outright (and the split-reassembly prefix pattern dropped
fragmented ones as garbage), so the grow-back report after an iOS soft
keyboard dismissal under tmux-over-SSH never applied: rows stayed
pinned at the keyboard-present height, with no accompanying OS resize
event to reconcile the cached in-band geometry.
Capture the leading digits of each field and skip the subparameter
tail; accept `:` in the reassembly prefix so split reports complete
instead of leaking their tails into the editor as keystrokes.
Fixes#4748
- Added a deterministic ProcessTerminal render harness with real TUI and resize simulation.
- Added reflow tests for OS resize fallback, in-band precedence, and split in-band parsing.
- Added a regression test ensuring stale live-region rows are cleared after rerender.
- Removed the duplicate in-band authority assertion from terminal-appearance tests.
