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fix(tui): cursor position tracking when content shrinks with unchanged lines

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This commit is contained in:
Mario Zechner 2026-01-11 03:00:23 +01:00
parent d7394eb109
commit 3bb115a39c
3 changed files with 69 additions and 0 deletions
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25
packages/tui/src/tui.ts
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@ -385,6 +385,31 @@ export class TUI extends Container {
return;
}
// All changes are in deleted lines (nothing to render, just clear)
if (firstChanged >= newLines.length) {
if (this.previousLines.length > newLines.length) {
let buffer = "\x1b[?2026h";
// Move to end of new content
const targetRow = newLines.length - 1;
const lineDiff = targetRow - this.cursorRow;
if (lineDiff > 0) buffer += `\x1b[${lineDiff}B`;
else if (lineDiff < 0) buffer += `\x1b[${-lineDiff}A`;
buffer += "\r";
// Clear extra lines
const extraLines = this.previousLines.length - newLines.length;
for (let i = 0; i < extraLines; i++) {
buffer += "\r\n\x1b[2K";
}
buffer += `\x1b[${extraLines}A`;
buffer += "\x1b[?2026l";
this.terminal.write(buffer);
this.cursorRow = newLines.length - 1;
}
this.previousLines = newLines;
this.previousWidth = width;
return;
}
// Check if firstChanged is outside the viewport
// cursorRow is the line where cursor is (0-indexed)
// Viewport shows lines from (cursorRow - height + 1) to cursorRow