fix: keep editor playback active on playhead changes

tests/test_ui_structure.py

@@ -1076,6 +1076,51 @@ def test_editor_play_button_loops_selection_when_playhead_inside(win, tmp_path,
     assert seen == {"start": 1.25, "end": 2.75, "loop": True}
 
 
+def test_editor_playhead_change_keeps_playback_running(win, tmp_path, monkeypatch):
+    import main as m
+    src = tmp_path / "v0.wav"; src.write_bytes(b"")
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._clip_dur = 5.0
+    dlg._wave.set_view(0.0, 5.0)
+    dlg._wave.set_selection(1.25, 2.75)
+    dlg._wave.set_playhead(4.0)
+    dlg._play_proc = object()
+    dlg._btn_play.setChecked(True)
+    seen = {}
+    stopped = {"n": 0}
+    monkeypatch.setattr(
+        dlg, "_play_current",
+        lambda start=None, end=None, loop=False:
+            seen.update(start=start, end=end, loop=loop))
+    monkeypatch.setattr(dlg, "_stop_play", lambda: stopped.__setitem__("n", stopped["n"] + 1))
+    dlg._on_wave_playhead_changed(4.0)
+    assert seen == {"start": 4.0, "end": 5.0, "loop": False}
+    assert stopped["n"] == 0
+    assert dlg._btn_play.isChecked()
+
+
+def test_editor_playhead_change_keeps_looping_when_inside_selection(win, tmp_path, monkeypatch):
+    import main as m
+    src = tmp_path / "v0.wav"; src.write_bytes(b"")
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._clip_dur = 5.0
+    dlg._wave.set_view(0.0, 5.0)
+    dlg._wave.set_selection(1.25, 2.75)
+    dlg._wave.set_playhead(2.0)
+    dlg._play_proc = object()
+    dlg._btn_play.setChecked(True)
+    seen = {}
+    stopped = {"n": 0}
+    monkeypatch.setattr(
+        dlg, "_play_current",
+        lambda start=None, end=None, loop=False:
+            seen.update(start=start, end=end, loop=loop))
+    monkeypatch.setattr(dlg, "_stop_play", lambda: stopped.__setitem__("n", stopped["n"] + 1))
+    dlg._on_wave_playhead_changed(2.0)
+    assert seen == {"start": 1.25, "end": 2.75, "loop": True}
+    assert stopped["n"] == 0
+
+
 def test_editor_has_local_speed_controls(win, tmp_path):
     import main as m
     from PyQt6.QtWidgets import QPushButton