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fix(tui): reduce unnecessary full redraws for better performance

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- Remove height change detection (only width changes trigger full redraw)
- Change clearOnShrink default to false (use PI_CLEAR_ON_SHRINK=1 to enable)
- Fix viewport check to use previousLines.length instead of maxLinesRendered
  (prevents false positive redraws when appending lines after content shrunk)
- Add clearOnShrink setting to /settings in coding-agent
- Remove line truncation in custom message component (always show full content)
This commit is contained in:
Mario Zechner 2026-02-02 08:10:08 +01:00
parent 419c07fb19
commit 0925fafe3b
8 changed files with 80 additions and 48 deletions
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28
packages/tui/test/tui-render.test.ts
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@ -23,31 +23,6 @@ function getCellItalic(terminal: VirtualTerminal, row: number, col: number): num
}
describe("TUI resize handling", () => {
it("triggers full re-render when terminal height changes", async () => {
const terminal = new VirtualTerminal(40, 10);
const tui = new TUI(terminal);
const component = new TestComponent();
tui.addChild(component);
component.lines = ["Line 0", "Line 1", "Line 2"];
tui.start();
await terminal.flush();
const initialRedraws = tui.fullRedraws;
// Resize height
terminal.resize(40, 15);
await terminal.flush();
// Should have triggered a full redraw
assert.ok(tui.fullRedraws > initialRedraws, "Height change should trigger full redraw");
const viewport = terminal.getViewport();
assert.ok(viewport[0]?.includes("Line 0"), "Content preserved after height change");
tui.stop();
});
it("triggers full re-render when terminal width changes", async () => {
const terminal = new VirtualTerminal(40, 10);
const tui = new TUI(terminal);
@ -75,6 +50,7 @@ describe("TUI content shrinkage", () => {
it("clears empty rows when content shrinks significantly", async () => {
const terminal = new VirtualTerminal(40, 10);
const tui = new TUI(terminal);
tui.setClearOnShrink(true); // Explicitly enable (may be disabled via env var)
const component = new TestComponent();
tui.addChild(component);
@ -106,6 +82,7 @@ describe("TUI content shrinkage", () => {
it("handles shrink to single line", async () => {
const terminal = new VirtualTerminal(40, 10);
const tui = new TUI(terminal);
tui.setClearOnShrink(true); // Explicitly enable (may be disabled via env var)
const component = new TestComponent();
tui.addChild(component);
@ -128,6 +105,7 @@ describe("TUI content shrinkage", () => {
it("handles shrink to empty", async () => {
const terminal = new VirtualTerminal(40, 10);
const tui = new TUI(terminal);
tui.setClearOnShrink(true); // Explicitly enable (may be disabled via env var)
const component = new TestComponent();
tui.addChild(component);