A new attach replayed the tail of the raw byte buffer. That tail starts
mid-stream, long after a full-screen program set the modes, colours and
cursor position that give those bytes meaning, so a browser refresh
painted garbage over every agent TUI until something forced a repaint —
which is why opening the same session in the TUI (a resize) fixed it.
Ask tmux for the pane's current screen instead, and fall back to the byte
buffer when there is no pane left to capture, as for a dead session.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
