fix stop button disabled during connection

apps/studio/tests/test_ui_smoke.py

@@ -201,6 +201,52 @@ def test_toolbar_run_button_is_labelled(make_window):
     assert window.toolbar.btn_run.text() != label
 
 
+def test_stop_cancels_a_hung_connect(make_window):
+    """Stop must stay live and take effect instantly while connecting."""
+    import time
+
+    import ui_check
+    from orisys_app_shared.i18n import t
+
+    window = _show(make_window(sensor_type="box", source_mode="camera"), (1440, 880))
+    stuck = ui_check._StuckWorker()
+    window._ensure_workers = lambda: None
+    window._box_worker = stuck
+    window._finger_worker = stuck
+
+    window.toolbar.btn_run.setChecked(True)
+    assert window._session_phase == "connecting"
+    assert window.toolbar.btn_run.isEnabled(), "Stop is disabled while connecting"
+    assert window.toolbar.btn_run.text() == t("toolbar.cancel_label")
+    assert window.act_stop.isEnabled()
+
+    started = time.perf_counter()
+    window.toolbar.btn_run.setChecked(False)
+    elapsed = time.perf_counter() - started
+    assert elapsed < 0.5, f"Stop blocked the GUI for {elapsed:.2f}s"
+    assert not window._running
+    assert stuck.thread_still_owned, "Stop abandoned the still-running worker thread"
+
+
+def test_escape_cancels_a_hung_connect(make_window):
+    import time
+
+    import ui_check
+
+    window = _show(make_window(sensor_type="box", source_mode="camera"), (1440, 880))
+    stuck = ui_check._StuckWorker()
+    window._ensure_workers = lambda: None
+    window._box_worker = stuck
+    window._finger_worker = stuck
+
+    window.toolbar.btn_run.setChecked(True)
+    assert window.act_stop.shortcut().toString() == "Esc"
+    started = time.perf_counter()
+    window._on_stop_shortcut()
+    assert time.perf_counter() - started < 0.5
+    assert not window._running
+
+
 def test_theme_switch_updates_panels(make_window):
     window = _show(make_window(), (1400, 880))
     window._set_theme("light")