fix GTk3 deprecation warning

Zybulon · Zybulon · commit c1cdb5d15e56 · 2024-05-12T17:47:43.000+02:00
diff --git a/lib/matplotlib/backends/backend_gtk3.py b/lib/matplotlib/backends/backend_gtk3.py
@@ -339,7 +339,7 @@ def __init__(self, canvas):
     def save_figure(self, *args):
         dialog = Gtk.FileChooserDialog(
             title="Save the figure",
-            parent=self.canvas.get_toplevel(),
+            transient_for=self.canvas.get_toplevel(),
             action=Gtk.FileChooserAction.SAVE,
             buttons=(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                      Gtk.STOCK_SAVE,   Gtk.ResponseType.OK),
