[gtk+/gtk-3-0] widget: Add hack to make label mnemonics work again

[Benjamin Otte <otte src gnome org>]

commit f85feed1136a1e8dcf60b79cf000d723c22378f3
Author: Benjamin Otte <otte redhat com>
Date:   Tue Apr 26 14:07:27 2011 +0200

    widget: Add hack to make label mnemonics work again
    
    Mnemonics for characters that go beyond the baseline (q, y, g) were not
    being shown, because they are drawn outside of the label's allocated
    size.
    This patch just disables the clip-to-size for labels, so that the label
    can draw outsize of its allocation. In most cases, that works around
    this bug.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=648570

 gtk/gtkwidget.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 4d7df85..ae83564 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -5659,6 +5659,20 @@ gtk_cairo_should_draw_window (cairo_t *cr,
          event->window == window;
 }
 
+static gboolean
+gtk_widget_get_clip_draw (GtkWidget *widget)
+{
+  /* labels are not clipped, because clipping them would cause
+   * mnemonics to not appear on characters that go beyond the
+   * baseline.
+   * https://bugzilla.gnome.org/show_bug.cgi?id=648570
+   */
+  if (GTK_IS_LABEL (widget))
+    return FALSE;
+
+  return TRUE;
+}
+
 /* code shared by gtk_container_propagate_draw() and
  * gtk_widget_draw()
  */
@@ -5672,6 +5686,8 @@ _gtk_widget_draw_internal (GtkWidget *widget,
   if (!gtk_widget_is_drawable (widget))
     return;
 
+  clip_to_size &= gtk_widget_get_clip_draw (widget);
+
   if (clip_to_size)
     {
       cairo_rectangle (cr,