fix: let lock mode scrub audio timeline playhead

tests/test_ui_structure.py

@@ -371,6 +371,42 @@ def test_timeline_audio_hover_cursor_state(win):
     assert tl._audio_hit_at_x(tl._time_to_x(12.0)) == "create"
 
 
+def test_timeline_audio_mode_lock_click_scrubs_playhead_not_region(win):
+    from PyQt6.QtCore import QEvent, QPointF, Qt
+    from PyQt6.QtGui import QMouseEvent
+    tl = win._timeline
+    tl._duration = 20.0
+    tl._view_start = 0.0
+    tl._view_span = 20.0
+    tl.resize(400, tl.height() or 80)
+    tl.set_audio_mode(True)
+    tl.set_audio_region(4.0, 8.0)
+    tl.set_cursor(4.0)
+    tl._locked = True
+    got_seek = []
+    got_audio = []
+    tl.seek_changed.connect(lambda t: got_seek.append(t))
+    tl.audio_region_changed.connect(lambda s, e: got_audio.append((s, e)))
+
+    x = tl._time_to_x(12.0)
+    y = tl._SCROLLBAR_H + tl._RULER_H + 20
+    press = QMouseEvent(
+        QEvent.Type.MouseButtonPress, QPointF(x, y),
+        Qt.MouseButton.LeftButton, Qt.MouseButton.LeftButton,
+        Qt.KeyboardModifier.NoModifier)
+    release = QMouseEvent(
+        QEvent.Type.MouseButtonRelease, QPointF(x, y),
+        Qt.MouseButton.LeftButton, Qt.MouseButton.NoButton,
+        Qt.KeyboardModifier.NoModifier)
+    tl.mousePressEvent(press)
+    tl.mouseReleaseEvent(release)
+
+    assert abs((tl._play_pos or 0.0) - 12.0) < 0.1
+    assert tl._audio_region == (4.0, 8.0)
+    assert not got_audio
+    assert got_seek and abs(got_seek[-1] - 12.0) < 0.1
+
+
 def test_timeline_audio_mode_follows_deck(win):
     win._control_deck.setCurrentWidget(win._tab_audio)
     assert win._timeline._audio_mode is True