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fix(tui): fix scrollback overwrite when appending lines past viewport

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Appended lines were not committed to terminal scrollback because the
renderer used cursor movement (CSI B) and carriage return without
linefeed. This caused earlier content to be overwritten when the
viewport filled up.

Changes:
- For appended lines, emit \r\n to create real scrollback lines
- When target row is below viewport, scroll with \r\n before positioning
- Add PI_TUI_WRITE_LOG env var for debugging raw ANSI output
- Add fullRedraws readonly property to TUI class
- Add viewport-overwrite-repro.ts test script

fixes #954
This commit is contained in:
Mario Zechner 2026-01-26 16:51:28 +01:00
parent fa8b26a184
commit a6f9c3cf0d
6 changed files with 165 additions and 6 deletions
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6
packages/tui/CHANGELOG.md
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@ -2,8 +2,14 @@
## [Unreleased]
### Added
- Added `fullRedraws` readonly property to TUI class for tracking full screen redraws
- Added `PI_TUI_WRITE_LOG` environment variable to capture raw ANSI output for debugging
### Fixed
- Fixed appended lines not being committed to scrollback, causing earlier content to be overwritten when viewport fills ([#954](https://github.com/badlogic/pi-mono/issues/954))
- Slash command menu now only triggers when the editor input is otherwise empty ([#904](https://github.com/badlogic/pi-mono/issues/904))
- Center-anchored overlays now stay vertically centered when resizing the terminal taller after a shrink ([#950](https://github.com/badlogic/pi-mono/pull/950) by [@nicobailon](https://github.com/nicobailon))
- Fixed editor multi-line insertion handling and lastAction tracking ([#945](https://github.com/badlogic/pi-mono/pull/945) by [@Perlence](https://github.com/Perlence))