test(e2e): wait for the paired-reveal decoy to settle at its new size (#28319)

* test(e2e): read the parked-reveal decoy grid only after it settles at the new fit

* test(e2e): name the settle wait and give it the file's reveal timeout

tests/e2e/paired-remote-terminal-parked-reveal-interactivity.spec.ts

@@ -191,6 +191,22 @@ async function readActivePaneGrid(
   }, webTabId)
 }
 
+/** The pane's grid, or null while it differs from what its container fits. */
+async function readFittedPaneGrid(
+  page: Page,
+  webTabId: string
+): Promise<{ cols: number; rows: number } | null> {
+  return page.evaluate((id) => {
+    const manager = window.__paneManagers?.get(id)
+    const pane = manager?.getActivePane?.() ?? manager?.getPanes?.()[0] ?? null
+    const fit = pane?.fitAddon.proposeDimensions()
+    if (!pane || !fit || pane.terminal.cols !== fit.cols || pane.terminal.rows !== fit.rows) {
+      return null
+    }
+    return { cols: fit.cols, rows: fit.rows }
+  }, webTabId)
+}
+
 /** Reads the target tab's own buffer. `getTerminalContent` resolves whatever
  *  tab the store thinks is active, which hides per-tab reveal failures. */
 async function readPaneContent(page: Page, webTabId: string): Promise<string> {
@@ -423,10 +439,25 @@ test('paired client keeps revealed remote terminals interactive', async ({
       await openClientTab(client.page, worktreeId, decoys[0].webTabId)
       const originalGrid = await readActivePaneGrid(client.page, target.webTabId)
       await client.page.setViewportSize({ width: 960, height: 800 })
+      // Why fitted: a late reveal replay briefly parses at the host's old grid before refitting (#7279, #18132).
+      const fitted: { lastKey: string | null; settled: { cols: number; rows: number } | null } = {
+        lastKey: null,
+        settled: null
+      }
       await expect
-        .poll(() => readActivePaneGrid(client.page, decoys[0].webTabId))
-        .not.toEqual(originalGrid)
-      const revealGrid = await readActivePaneGrid(client.page, decoys[0].webTabId)
+        .poll(
+          async () => {
+            const grid = await readFittedPaneGrid(client.page, decoys[0].webTabId)
+            const key = grid && JSON.stringify(grid)
+            const isNewFit = key !== null && key !== JSON.stringify(originalGrid)
+            fitted.settled = isNewFit && key === fitted.lastKey ? grid : null
+            fitted.lastKey = isNewFit ? key : null
+            return fitted.settled !== null
+          },
+          { timeout: 60_000, message: 'decoy never settled at the new viewport fit' }
+        )
+        .toBe(true)
+      const revealGrid = fitted.settled
       if (!revealGrid) {
         throw new Error('visible decoy has no grid')
       }