fix: keep editor playback active on playhead changes

main.py

@@ -4508,6 +4508,9 @@ class AudioEditorDialog(QDialog):
         if not checked:
             self._stop_play()
             return
+        self._play_from_playhead()
+
+    def _play_from_playhead(self) -> None:
         play_t = self._playhead_secs()
         se = self._selection_secs()
         if se is not None and se[0] <= play_t <= se[1]:
@@ -4539,7 +4542,7 @@ class AudioEditorDialog(QDialog):
                       end: float | None = None,
                       loop: bool = False) -> None:
         from PyQt6.QtCore import QProcess
-        self._stop_play()
+        self._stop_play(reset_button=False)
         self._play_proc = QProcess(self)
         self._play_proc.finished.connect(self._on_play_finished)
         self._play_proc.errorOccurred.connect(self._on_play_error)
@@ -4570,7 +4573,7 @@ class AudioEditorDialog(QDialog):
 
     def _on_wave_playhead_changed(self, t: float) -> None:
         if self._play_proc is not None:
-            self._stop_play()
+            self._play_from_playhead()
 
     def _playhead_secs(self) -> float:
         t = self._wave.playhead()
@@ -4623,7 +4626,7 @@ class AudioEditorDialog(QDialog):
             self._btn_play.setChecked(False)
             self._btn_play.blockSignals(False)
 
-    def _stop_play(self) -> None:
+    def _stop_play(self, reset_button: bool = True) -> None:
         proc = self._play_proc
         self._play_proc = None
         self._playhead_timer.stop()
@@ -4636,8 +4639,9 @@ class AudioEditorDialog(QDialog):
             proc.kill()
             proc.waitForFinished(100)
             proc.deleteLater()
-        self._btn_play.setText("▶ Play")
-        if self._btn_play.isChecked():
+        if reset_button:
+            self._btn_play.setText("▶ Play")
+        if reset_button and self._btn_play.isChecked():
             self._btn_play.blockSignals(True)
             self._btn_play.setChecked(False)
             self._btn_play.blockSignals(False)

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