Address PR #3602 review feedback from chatgpt-codex-connector:
when the terminal fragments a bracketed paste across stdin chunks
(\x1b[200~ in one read, \x1b[201~ in the next — Windows Terminal
under load, certain SSH muxes, tmux extended-keys passthrough),
the previous single-chunk `isEmptyBracketedPaste` /
`extractBracketedImagePastePaths` guards never saw both markers
in the same `handleInput` call. The inherited
`BracketedPasteHandler` then buffered the run as a zero-length
text paste and Cmd+V still disappeared.
CustomEditor now owns its own BracketedPasteHandler that runs
ahead of `super.handleInput`, so split bracketed pastes resolve
to a single assembled payload before any routing decision:
- empty payload -> onPasteImage (Cmd+V macOS image-only screenshot)
- image-file paths -> onPasteImagePath (#3506 also gains split-chunk
coverage as a bonus)
- everything else -> base editor's public `pasteText` so the
`[Paste #N]` markers, autocomplete, and undo state stay intact
Removed the now-redundant single-chunk `isEmptyBracketedPaste`
helper. New repro tests cover the split-chunk empty paste, the
split-chunk image-file path, and a split-chunk text paste
forwarding exactly once to the base editor.
roboomp
f2db96c819