frame_touch: any event that goes through clears the stale flag

A trackpad move names no panel, so waiting for an aimed event could leave
the page re-reading panels for the rest of the session; a release still
aimed at the old panel doesn't count.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/test_touch.py

@@ -138,6 +138,15 @@ class Apply(unittest.TestCase):
         self.assertEqual(self.said, [("ready", {"focus": 7, "display": ":1", "stale": True}),
                                      ("ready", {"focus": 7, "display": ":1"})])
 
+    def test_stale_clears_on_a_trackpad_move_but_not_on_a_stale_release(self):
+        gs = FakeGamescope()
+        panel = self.t.apply(gs, {"fx": 0.5, "fy": 0.5, "window": 99, "display": ":1"}, None)
+        panel = self.t.apply(gs, {"button": "left", "down": False, "window": 99, "display": ":1"}, panel)
+        self.assertTrue(self.t.STALE[0])  # that release was still aimed at the old panel
+        self.t.apply(gs, {"dx": 3, "dy": 0}, panel)
+        self.assertFalse(self.t.STALE[0])
+        self.assertEqual(self.said[-1][1].get("stale"), None)
+
     def test_same_window_id_on_the_other_display_is_another_panel(self):
         gs = FakeGamescope()
         self.t.apply(gs, {"fx": 0.5, "fy": 0.5, "window": 7, "display": ":0"}, None)

ui/frame_touch.py

@@ -369,9 +369,10 @@ def apply(gs, event, panel):
         say("ready", focus=panel.get("window"), display=panel.get("display"), stale=True)  # the page re-syncs
         STALE[0] = True
         return panel
-    if "window" in event and STALE[0]:
+    if STALE[0] and not stale:
+        # Anything that goes through (a trackpad move names no panel) means caught up: stop re-syncing.
         STALE[0] = False
-        say("ready", focus=panel.get("window"), display=panel.get("display"))  # caught up: stop re-syncing
+        say("ready", focus=(panel or {}).get("window"), display=(panel or {}).get("display"))
     if "fx" in event and panel and panel.get("window"):
         gs.move_to(*to_root(panel, number(event["fx"], 1), number(event["fy"], 1)))
     if "dx" in event or "dy" in event: