MainWindow: Delete dead code.

src/View/MainWindow.py

@@ -1415,15 +1415,3 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             f"sqlitebrowser {file}",
             shell=True
         )
-
-    # TODO: Delete me !
-    ###############
-    # DUMMY STUFF #
-    ###############
-
-    def open_dummy(self, title="Dummy"):
-        self.dummy = DummyWindow(
-            title=title if type(title) is str else "Dummy",
-            parent=self
-        )
-        self.dummy.show()