Fix ME/SE details dialogs, add preferences

* Fix ME and SE versions of details dialog not displaying their content properly after change to QDockWidget
* Add option to toggle titlebar and orientation of titlebar in preferences dialog
* Fix setting layout on PE details dialog window while layout already set, by removing the self (parent) reference in constructing the QSplitter

qt/app.py

@@ -54,11 +54,11 @@ class DupeGuru(QObject):
     def _setup(self):
         core.pe.photo.PLAT_SPECIFIC_PHOTO_CLASS = PlatSpecificPhoto
         self._setupActions()
+        self.details_dialog = None
         self._update_options()
         self.recentResults = Recent(self, "recentResults")
         self.recentResults.mustOpenItem.connect(self.model.load_from)
         self.resultWindow = None
-        self.details_dialog = None
         self.directories_dialog = DirectoriesDialog(self)
         self.progress_window = ProgressWindow(
             self.directories_dialog, self.model.progress_window
@@ -152,6 +152,9 @@ class DupeGuru(QObject):
         self.model.options["match_scaled"] = self.prefs.match_scaled
         self.model.options["picture_cache_type"] = self.prefs.picture_cache_type
 
+        if self.details_dialog:
+            self.details_dialog.update_options()
+
     # --- Private
     def _get_details_dialog_class(self):
         if self.model.app_mode == AppMode.Picture: