[gtk+/gtk-3-6] gtk: fix scrolling in modal dialogs when event_widget is insensitive

[Michael Natterer <mitch src gnome org>]

commit f89b149eeb7ddd8b39c21f294223357c2b3a7443
Author: Michael Natterer <mitch gimp org>
Date:   Fri Dec 14 15:53:29 2012 +0100

    gtk: fix scrolling in modal dialogs when event_widget is insensitive
    
    When checking for modal grabs in gtk_main_do_event(), forward
    GDK_SCROLL events to event_widget, even if it is insensitive.
    (cherry picked from commit 343f1706bd51b830ff66c67b163f397889a96758)

 gtk/gtkmain.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index dd141bd..87e00a5 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1558,7 +1558,7 @@ gtk_main_do_event (GdkEvent *event)
    * This is the key to implementing modality.
    */
   if (!grab_widget ||
-      (gtk_widget_is_sensitive (event_widget) &&
+      ((gtk_widget_is_sensitive (event_widget) || event->type == GDK_SCROLL) &&
        gtk_widget_is_ancestor (event_widget, grab_widget)))
     grab_widget = event_widget;