Add transient_for property to about dialog

Author: oscfdezdz

src/diffuse/dialogs.py

@@ -33,8 +33,9 @@
 
 # the about dialog
 class AboutDialog(Gtk.AboutDialog):
-    def __init__(self) -> None:
+    def __init__(self, parent: Gtk.Widget) -> None:
         Gtk.AboutDialog.__init__(self)
+        self.set_transient_for(parent)
         self.set_logo_icon_name('io.github.mightycreak.Diffuse')
         self.set_program_name(constants.APP_NAME)
         self.set_version(constants.VERSION)

src/diffuse/window.py

@@ -1791,7 +1791,7 @@ def _path_to_url(path: str, proto: str = 'file') -> str:
 
     # callback for the about menu item
     def about_cb(self, widget, data):
-        dialog = AboutDialog()
+        dialog = AboutDialog(self.get_toplevel())
         dialog.run()
         dialog.destroy()