Decodes printable UTF-8, the control keys, arrows in both CSI and SS3 forms and
SGR mouse reports out of a byte stream that can tear anywhere, so a sequence
split across two reads decodes the same as one that arrives whole.
A lone ESC cannot be told from the start of an arrow key by looking at bytes,
so the parser holds it and the caller resolves it with flush() once its
disambiguation timer fires. Unknown sequences are swallowed: a stray CSI must
never reach a prompt composer as typed text.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The preview pane shows a session's raw terminal stream, so it needs the tail
reconstructed rather than emulated: SGR survives, cursor steering and OSC do
not, and a carriage return returns to column 0 so a spinner that repaints its
line 200 times contributes one line instead of 200.
Widths count East Asian Wide characters as two columns, which the clip and pad
helpers rely on to never cut a wide character, a code point or an escape
sequence in half.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Codeman maintainer