Merge pull request #28829 from NousResearch/bb/tui-no-history-truncation

fix(tui): render full assistant text in scrollback (no history truncation)

ui-tui/src/__tests__/text.test.ts

@@ -1,7 +1,6 @@
 import { describe, expect, it } from 'vitest'
 
 import {
-  boundedHistoryRenderText,
   boundedLiveRenderText,
   buildToolTrailLine,
   edgePreview,
@@ -160,15 +159,6 @@ describe('boundedLiveRenderText', () => {
   })
 })
 
-describe('boundedHistoryRenderText', () => {
-  it('uses a non-live omission label for completed history', () => {
-    const out = boundedHistoryRenderText('abcdefghij', { maxChars: 4, maxLines: 10 })
-
-    expect(out).toContain('[showing tail; omitted')
-    expect(out).not.toContain('live tail')
-  })
-})
-
 describe('edgePreview', () => {
   it('keeps both ends for long text', () => {
     expect(edgePreview('Vampire Bondage ropes slipped from her neck, still stained with blood', 8, 18)).toBe(

ui-tui/src/__tests__/virtualHeights.test.ts

@@ -39,4 +39,19 @@ describe('virtual height estimates', () => {
 
     expect(withSep).toBe(base + 2)
   })
+
+  it('caps wrapped-line counting so giant assistant turns do not block offset rebuilds', () => {
+    // wrappedLines is invoked once per uncached message during
+    // useVirtualHistory's offset rebuild. Unbounded counting on a long
+    // assistant response (10k+ chars × every row × every rebuild) blocks
+    // the UI on cold mount. Cap is ~800 rows; post-mount Yoga
+    // measurement converges to the true height regardless.
+    const giant = 'x'.repeat(1_000_000)
+    const t0 = performance.now()
+    const rows = wrappedLines(giant, 80)
+    const elapsed = performance.now() - t0
+
+    expect(rows).toBeLessThanOrEqual(800)
+    expect(elapsed).toBeLessThan(50)
+  })
 })