fix(location): a POI key held with Cmd, Ctrl or Alt runs no POI

The points-of-interest keys (Q/W/E/R/T while a city is expanded) are a
second bare-key document listener, and it did not look at modifiers
either: Alt+R or a delivered Ctrl+R picked the fourth POI and flew the
camera there. It now leaves Cmd, Ctrl and Alt chords to the browser like
the application shortcuts; Shift still counts as the key. The docs and
the changelog entry say so.

src/ui/locationControls.js

@@ -88,6 +88,9 @@ export class LocationControls {
         event.target === elements.search
       )
         return;
+      // As for the application shortcuts: Cmd+R, Ctrl+W, Alt+E and the like
+      // belong to the browser and the system. Shift is not a chord.
+      if (event.metaKey || event.ctrlKey || event.altKey) return;
       const index = POI_KEYS.indexOf(event.key.toUpperCase());
       if (index !== -1 && index < (cities[cityId]?.pois.length || 0))
         onPoi(cityId, index);

src/ui/locationControls.test.mjs

@@ -191,6 +191,16 @@ test('location and POI keys route once while form controls retain typing', () =>
   f.controls.reset();
   assert.deepEqual(f.calls, [['poi', 'a', 1], ['reset']]);
 });
+test('POI keys held with Cmd, Ctrl or Alt run no POI; Shift still does', () => {
+  const f = fixture();
+  const target = { matches: () => false };
+  for (const modifier of ['metaKey', 'ctrlKey', 'altKey'])
+    for (const key of ['q', 'w', 'r', 'R'])
+      f.doc.fire('keydown', { key, target, [modifier]: true });
+  assert.deepEqual(f.calls, []);
+  f.doc.fire('keydown', { key: 'W', target, shiftKey: true });
+  assert.deepEqual(f.calls, [['poi', 'a', 1]]);
+});
 test('typing clears a failed search error and closing the emptied field drops it too', () => {
   const f = fixture();
   f.elements.search.value = 'Pariss';