[gtk/ebassi/issue-4421] Unrealize ATContext on unroot

[Emmanuele Bassi <ebassi src gnome org>]

commit 018388d32116b2600ecdf9a7bd5cbbb6873b8818
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 8 10:14:48 2021 +0000

    Unrealize ATContext on unroot
    
    Non-root widgets should unrealize their ATContext, if they have one,
    when they are unrooted, as they don't have a connection to a top level
    any more.
    
    Fixes: #4421

 gtk/gtkwidget.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 907e2004f2..b0921818a8 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -2441,6 +2441,18 @@ gtk_widget_root_at_context (GtkWidget *self)
   gtk_at_context_set_display (priv->at_context, gtk_root_get_display (priv->root));
 }
 
+static void
+gtk_widget_unroot_at_context (GtkWidget *self)
+{
+  GtkWidgetPrivate *priv = gtk_widget_get_instance_private (self);
+
+  if (priv->at_context != NULL)
+    {
+      gtk_at_context_set_display (priv->at_context, gdk_display_get_default ());
+      gtk_at_context_unrealize (priv->at_context);
+    }
+}
+
 void
 gtk_widget_realize_at_context (GtkWidget *self)
 {
@@ -2532,6 +2544,9 @@ gtk_widget_unroot (GtkWidget *widget)
 
   if (!GTK_IS_ROOT (widget))
     {
+      /* Roots unrealize the ATContext on unmap */
+      gtk_widget_unroot_at_context (widget);
+
       priv->root = NULL;
       g_object_notify_by_pspec (G_OBJECT (widget), widget_props[PROP_ROOT]);
     }