fix: sync editor playhead with selection changes

main.py

@@ -4365,6 +4365,7 @@ class AudioEditorDialog(QDialog):
         self._healed_seams: dict[str, list[float]] = {}
 
         self._wave = AudioWaveform()
+        self._wave.selection_changed.connect(self._on_wave_selection_changed)
         self._wave.playhead_changed.connect(self._on_wave_playhead_changed)
         self._btn_heal_cut = QPushButton("Heal Cut")
         self._btn_delete = QPushButton("Delete")
@@ -4616,6 +4617,13 @@ class AudioEditorDialog(QDialog):
             return
         self._play_current(*self._join_preview)
 
+    def _on_wave_selection_changed(self, s: float, e: float) -> None:
+        was_playing = self._play_proc is not None
+        prior_playhead = self._playhead_secs()
+        self._wave.set_playhead(s)
+        if was_playing and (self._play_loop or s <= prior_playhead <= e):
+            self._play_current(s, e, loop=True)
+
     def _on_wave_playhead_changed(self, t: float) -> None:
         if self._play_proc is not None:
             self._play_from_playhead()

tests/test_ui_structure.py

@@ -1158,6 +1158,37 @@ def test_editor_playhead_change_keeps_looping_when_inside_selection(win, tmp_pat
     assert stopped["n"] == 0
 
 
+def test_editor_selection_change_moves_playhead_to_area_start(win, tmp_path):
+    import main as m
+    src = tmp_path / "v0.wav"; src.write_bytes(b"")
+    dlg = m.AudioEditorDialog(str(src), parent=win)
+    dlg._clip_dur = 6.0
+    dlg._wave.set_view(0.0, 6.0)
+    dlg._wave.set_playhead(5.0)
+    dlg._on_wave_selection_changed(1.5, 3.5)
+    assert dlg._wave.playhead() == 1.5
+
+
+def test_editor_selection_change_updates_active_loop_bounds(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 = 6.0
+    dlg._wave.set_view(0.0, 6.0)
+    dlg._wave.set_selection(1.0, 3.0)
+    dlg._wave.set_playhead(2.0)
+    dlg._play_proc = object()
+    dlg._play_loop = True
+    seen = {}
+    monkeypatch.setattr(
+        dlg, "_play_current",
+        lambda start=None, end=None, loop=False:
+            seen.update(start=start, end=end, loop=loop))
+    dlg._on_wave_selection_changed(1.0, 4.0)
+    assert seen == {"start": 1.0, "end": 4.0, "loop": True}
+    assert dlg._wave.playhead() == 1.0
+
+
 def test_editor_has_local_speed_controls(win, tmp_path):
     import main as m
     from PyQt6.QtWidgets import QPushButton