fix(panels): a collapsed window keeps its chosen height; handle early tile failures

- A floating portable panel saved its measured box, so dragging a
  collapsed window stored its 50 px header strip and a reload clamped it
  to the minimum. It now saves the inline size the user chose. A unit
  test and a collapse -> drag -> reload -> expand step in the panel gate
  pin it.
- Coverage awaits the tile fetch and the one-time terrain table load
  together, so a tile that fails before the table loads is reported at
  once instead of surfacing as an unhandled rejection.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

scripts/qa-panel-resize.mjs

@@ -356,6 +356,61 @@ async function main() {
       near(restored[key], record[key], 2, `restored ${key}`);
     console.log('PASS: reload restores position and size');
 
+    // A collapsed window keeps the height chosen for it, through a drag of
+    // its header strip and a reload.
+    const setCollapsed = async (collapsed) => {
+      await page.evaluate(
+        (id, want) => {
+          const panel = document.getElementById(id);
+          if (panel.classList.contains('collapsed') !== want)
+            document
+              .querySelector(
+                `.panel-collapse-btn[data-collapse-target="${id}"]`,
+              )
+              .click();
+        },
+        PANEL_ID,
+        collapsed,
+      );
+      await page.waitForFunction(
+        (id, want) =>
+          document.getElementById(id).classList.contains('collapsed') === want,
+        {},
+        PANEL_ID,
+        collapsed,
+      );
+      await nextFrames(page);
+    };
+    await drag(handlePoint(await readPanel(), 'se'), 0, 200);
+    const chosen = await readPanel();
+    assert.ok(
+      chosen.height > MIN_SIZE.height + 150,
+      `the window grew to ${chosen.height}px`,
+    );
+    await setCollapsed(true);
+    const strip = await readPanel();
+    assert.ok(strip.height < chosen.height - 100, 'collapsed to its header');
+    await drag(await headerPoint(), 40, 30);
+    const movedStrip = await readPanel();
+    assert.equal(movedStrip.floating, true, 'the strip stays a window');
+    near(
+      JSON.parse(movedStrip.stored).height,
+      chosen.height,
+      2,
+      'stored height while collapsed',
+    );
+    await boot();
+    await setCollapsed(false);
+    near(
+      (await readPanel()).height,
+      chosen.height,
+      2,
+      'height after expanding',
+    );
+    console.log(
+      'PASS: a collapsed window keeps its height through a drag and a reload',
+    );
+
     const dock = await dockPanelByDoubleClick(page, PANEL_ID);
     const snapped = await readPanel();
     assert.equal(

src/layers/streetLevel/providers/mapillary/coverage.js

@@ -510,12 +510,14 @@ export function createCoverage({ state, source }) {
     state.coverage.pending.set(key, controller);
     notify();
     try {
-      // Fetch and the one-time terrain-height table load run side by side.
+      // Fetch and the one-time terrain-height table load run side by side,
-      const fetching = source.getTile('coverage', tile.z, tile.x, tile.y, {
+      // both handled from the start so an early tile failure is not unhandled.
-        signal: controller.signal,
+      const [bytes] = await Promise.all([
-      });
+        source.getTile('coverage', tile.z, tile.x, tile.y, {
-      if (kind === 'sequence') await ensureTerrainReady();
+          signal: controller.signal,
-      const bytes = await fetching;
+        }),
+        kind === 'sequence' ? ensureTerrainReady() : null,
+      ]);
       // Only an abort, a retire, a clear or a newer request for this tile
       // discards the bytes; a refresh that still wants the tile keeps them.
       const current = () =>

src/layers/streetLevel/providers/mapillary/coverage.test.mjs

@@ -906,3 +906,27 @@ test('a line across the date line from the camera is in mesh range', () => {
   const far = { west: -179.99, east: -179.97, south: -0.001, north: 0.001 };
   assert.equal(meshBoxInRange(far, camera), false);
 });
+
+test('a tile that fails before the terrain table loads is reported at once, never unhandled', async () => {
+  const { source, state, coverage, tileKey } = setup();
+  let terrainLoaded;
+  state.coverage.terrainReady = new Promise((resolve) => {
+    terrainLoaded = resolve;
+  });
+  const unhandled = [];
+  const onUnhandled = (reason) => unhandled.push(reason);
+  process.on('unhandledRejection', onUnhandled);
+  try {
+    coverage.refresh();
+    source.calls
+      .find((call) => call.key === tileKey)
+      .reject(new Error('Mapillary tiles HTTP 500'));
+    await new Promise((resolve) => setTimeout(resolve, 20));
+    assert.equal(state.coverage.lastError, 'Mapillary tiles HTTP 500');
+    assert.deepEqual(unhandled, []);
+  } finally {
+    terrainLoaded();
+    await settle();
+    process.off('unhandledRejection', onUnhandled);
+  }
+});

src/ui/panelDock.test.mjs

@@ -540,3 +540,41 @@ test('a floating header never lands under the command dock or voice pill', () =>
     f.restore();
   }
 });
+
+test('a collapsed floating window keeps its chosen height through a drag and a reload', () => {
+  const f = fixture();
+  try {
+    const { panel, handle } = floatingPanel(f, 'cctv-panel');
+    panel.style.height = '500px';
+    panel.classList.add('collapsed');
+    // Collapsed, the window measures only its header strip.
+    panel.getBoundingClientRect = () => {
+      const left = parseFloat(panel.style.left);
+      const top = parseFloat(panel.style.top);
+      return {
+        left,
+        top,
+        width: 360,
+        height: 50,
+        right: left + 360,
+        bottom: top + 50,
+      };
+    };
+    pointer(handle, 'pointerdown', { x: 200, y: 90 });
+    pointer(window, 'pointermove', { x: 260, y: 140 });
+    pointer(window, 'pointerup', { x: 260, y: 140 });
+    const record = JSON.parse(
+      f.store.get('godsEyeView.v8.panelPos.cctv-panel'),
+    );
+    assert.equal(record.height, 500, 'the chosen height, not the strip');
+    assert.equal(record.width, 360);
+
+    // Reload: a fresh panel restores the size it expands to.
+    const reloaded = f.element();
+    reloaded.id = 'cctv-panel';
+    f.owner._restorePanelPosition('cctv-panel', reloaded);
+    assert.equal(reloaded.style.height, '500px');
+  } finally {
+    f.restore();
+  }
+});

src/ui/panelPositionControls.js

@@ -429,10 +429,17 @@ export class PanelPositionControls {
       top: Math.round(rect.top),
     };
     if (this._portablePanels.has(panelId)) {
-      // Only an explicitly set size is remembered: freezing a collapsed
+      // Only an explicitly set size is remembered, and the inline value
-      // panel's measured height would stop it from ever expanding again.
+      // rather than the measured box: a collapsed window measures only its
-      if (panelEl.style.width) record.width = Math.round(rect.width);
+      // header but keeps the size the user chose for when it expands.
-      if (panelEl.style.height) record.height = Math.round(rect.height);
+      const chosen = (inline, measured) => {
+        const px = parseFloat(inline);
+        return Math.round(Number.isFinite(px) ? px : measured);
+      };
+      if (panelEl.style.width)
+        record.width = chosen(panelEl.style.width, rect.width);
+      if (panelEl.style.height)
+        record.height = chosen(panelEl.style.height, rect.height);
       record.floating = true;
     }
     try {