Straightened out Qt window parenting chain

qt/base/app.py

@@ -56,9 +56,9 @@ class DupeGuru(QObject):
         self._update_options()
         self.recentResults = Recent(self, 'recentResults')
         self.recentResults.mustOpenItem.connect(self.model.load_from)
-        self.resultWindow = self.RESULT_WINDOW_CLASS(self)
+        self.directories_dialog = DirectoriesDialog(self)
+        self.resultWindow = self.RESULT_WINDOW_CLASS(self.directories_dialog, self)
         self.progress_window = ProgressWindow(self.resultWindow, self.model.progress_window) 
-        self.directories_dialog = DirectoriesDialog(self.resultWindow, self)
         self.details_dialog = self.DETAILS_DIALOG_CLASS(self.resultWindow, self)
         self.problemDialog = ProblemDialog(parent=self.resultWindow, model=self.model.problem_dialog)
         self.ignoreListDialog = IgnoreListDialog(parent=self.resultWindow, model=self.model.ignore_list_dialog)

qt/base/directories_dialog.py

@@ -22,7 +22,7 @@ from .directories_model import DirectoriesModel, DirectoriesDelegate
 tr = trget('ui')
 
 class DirectoriesDialog(QMainWindow):
-    def __init__(self, parent, app, **kwargs):
+    def __init__(self, app, **kwargs):
         super().__init__(None, **kwargs)
         self.app = app
         self.lastAddedFolder = platform.INITIAL_FOLDER_IN_DIALOGS

qt/base/result_window.py

@@ -21,8 +21,8 @@ from .prioritize_dialog import PrioritizeDialog
 tr = trget('ui')
 
 class ResultWindow(QMainWindow):
-    def __init__(self, app, **kwargs):
-        super().__init__(None, **kwargs)
+    def __init__(self, parent, app, **kwargs):
+        super().__init__(parent, **kwargs)
         self.app = app
         self._setupUi()
         self.resultsModel = app.RESULT_MODEL_CLASS(self.app, self.resultsView)