[gtk] widget: Do proper clean up in real_hide()

[Benjamin Otte <otte src gnome org>]

commit 2380f9673bdd7f41fa8d0d05f23e3f75390c77df
Author: Benjamin Otte <otte redhat com>
Date:   Wed May 29 15:02:49 2019 +0200

    widget: Do proper clean up in real_hide()
    
    Do the same things set_visible_flag() does.

 gtk/gtkwidget.c | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 6e1a00d42e..0442c7b508 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -3239,6 +3239,15 @@ gtk_widget_real_hide (GtkWidget *widget)
 
   if (_gtk_widget_get_mapped (widget))
     gtk_widget_unmap (widget);
+
+  g_clear_pointer (&priv->allocated_transform, gsk_transform_unref);
+  priv->allocated_width = 0;
+  priv->allocated_height = 0;
+  priv->allocated_size_baseline = 0;
+  g_clear_pointer (&priv->transform, gsk_transform_unref);
+  priv->width = 0;
+  priv->height = 0;
+  gtk_widget_update_paintables (widget);
 }
 
 static void