From 9ec36544203d4c1b98aa843c2c3ff0a4f725da68 Mon Sep 17 00:00:00 2001
From: Sam Thursfield <sam.thursfield@codethink.co.uk>
Date: Thu, 03 May 2012 19:04:20 +0000
Subject: Bug 672582 - Fix selection behavior inside <iframe>

Since kinetic scrolling was introduced in Gtk+, GtkScrolledWindow
has had its own GdkWindow. This means we need to use the allocation
of the GtkScrolledWindow rather than its child GtkHTML widget when we
want to translate pointer coordinates relative to the iframe, because
a widget's GtkAllocation is relative to the parent GdkWindow.

(cherry picked from commit 7b7b37745d2f46914be314e4d7aef7a575529345)
---
diff --git a/gtkhtml/gtkhtml.c b/gtkhtml/gtkhtml.c
index 697b16e..6284855 100644
--- a/gtkhtml/gtkhtml.c
+++ b/gtkhtml/gtkhtml.c
@@ -1823,9 +1823,14 @@ shift_to_iframe_parent (GtkWidget *widget,
                         gint *y)
 {
 	while (GTK_HTML (widget)->iframe_parent) {
+		GtkWidget *scrolled_window;
 		GtkAllocation allocation;
 
-		gtk_widget_get_allocation (widget, &allocation);
+		scrolled_window = gtk_widget_get_parent (widget);
+
+		g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), widget);
+
+		gtk_widget_get_allocation (scrolled_window, &allocation);
 
 		if (x)
 			*x += allocation.x - GTK_HTML (widget)->engine->x_offset;
--
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