From a2a85a194c9a1fd3bf27e1087589e0d6c6ee9d48 Mon Sep 17 00:00:00 2001
From: John Ralls <jralls@ceridwen.us>
Date: Sat, 13 Aug 2011 14:11:29 -0700
Subject: [PATCH] Bug 655122: Lion crashes during resize.

Move resizing detection to a separate function and detect resizes so that they don't result in grabs (which was causing the crash).
---
 gdk/quartz/gdkevents-quartz.c | 85 +++++++++++++++++++++++++----------
 1 file changed, 61 insertions(+), 24 deletions(-)

diff --git a/gdk/quartz/gdkevents-quartz.c b/gdk/quartz/gdkevents-quartz.c
index 1334d83edc..9e273296a2 100644
--- a/gdk/quartz/gdkevents-quartz.c
+++ b/gdk/quartz/gdkevents-quartz.c
@@ -35,6 +35,7 @@
 
 #define GRIP_WIDTH 15
 #define GRIP_HEIGHT 15
+#define GDK_LION_RESIZE 5
 
 #define WINDOW_IS_TOPLEVEL(window)                      \
     (GDK_WINDOW_TYPE (window) != GDK_WINDOW_CHILD &&    \
@@ -689,30 +690,6 @@ find_window_for_ns_event (NSEvent *nsevent,
                 toplevel_private = (GdkWindowObject *)toplevel;
                 toplevel_impl = (GdkWindowImplQuartz *)toplevel_private->impl;
 
-                if ([toplevel_impl->toplevel showsResizeIndicator])
-                  {
-                    NSRect frame;
-
-                    /* If the resize indicator is visible and the event
-                     * is in the lower right 15x15 corner, we leave these
-                     * events to Cocoa as to be handled as resize events.
-                     * Applications may have widgets in this area.  These
-                     * will most likely be larger than 15x15 and for
-                     * scroll bars there are also other means to move
-                     * the scroll bar.  Since the resize indicator is
-                     * the only way of resizing windows on Mac OS, it
-                     * is too important to not make functional.
-                     */
-                    frame = [toplevel_impl->view bounds];
-                    if (x_tmp > frame.size.width - GRIP_WIDTH
-                        && x_tmp < frame.size.width
-                        && y_tmp > frame.size.height - GRIP_HEIGHT
-                        && y_tmp < frame.size.height)
-                      {
-                        return NULL;
-                      }
-                  }
-
                 *x = x_tmp;
                 *y = y_tmp;
               }
@@ -1065,6 +1042,63 @@ _gdk_quartz_events_get_current_event_mask (void)
   return current_event_mask;
 }
 
+/* Detect window resizing */
+
+static gboolean
+test_resize (NSEvent *event, GdkWindow *toplevel, gint x, gint y)
+{
+  GdkWindowObject *toplevel_private;
+  GdkWindowImplQuartz *toplevel_impl;
+  gboolean lion;
+  /* Resizing only begins if an NSLeftMouseButton event is received in
+   * the resizing area. Handle anything else.
+   */
+  if ([event type] != NSLeftMouseDown)
+      return FALSE;
+
+  toplevel_private = (GdkWindowObject *)toplevel;
+  toplevel_impl = (GdkWindowImplQuartz *)toplevel_private->impl;
+  if ([toplevel_impl->toplevel showsResizeIndicator])
+    {
+      NSRect frame;
+
+      /* If the resize indicator is visible and the event
+       * is in the lower right 15x15 corner, we leave these
+       * events to Cocoa as to be handled as resize events.
+       * Applications may have widgets in this area.  These
+       * will most likely be larger than 15x15 and for
+       * scroll bars there are also other means to move
+       * the scroll bar.  Since the resize indicator is
+       * the only way of resizing windows on Mac OS, it
+       * is too important to not make functional.
+       */
+      frame = [toplevel_impl->view bounds];
+      if (x > frame.size.width - GRIP_WIDTH
+	  && x < frame.size.width
+	  && y > frame.size.height - GRIP_HEIGHT
+	  && y < frame.size.height)
+	{
+	  return TRUE;
+	}
+     }
+  /* If we're on Lion and within 5 pixels of an edge,
+   * then assume that the user wants to resize, and
+   * return NULL to let Quartz get on with it. We check
+   * the selector isRestorable to see if we're on 10.7.
+   * This extra check is in case the user starts
+   * dragging before GDK recognizes the grab.
+   */
+
+  lion = gdk_quartz_osx_version() >= GDK_OSX_LION;
+  if (lion && (x < GDK_LION_RESIZE ||
+	       x > toplevel_private->width - GDK_LION_RESIZE ||
+	       y > toplevel_private->height - GDK_LION_RESIZE))
+    {
+      return TRUE;
+    }
+  return FALSE;
+}
+
 static gboolean
 gdk_event_translate (GdkEvent *event,
                      NSEvent  *nsevent)
@@ -1148,6 +1182,9 @@ gdk_event_translate (GdkEvent *event,
   window = find_window_for_ns_event (nsevent, &x, &y, &x_root, &y_root);
   if (!window)
     return FALSE;
+  /* Quartz handles resizing on its own, so we want to stay out of the way. */
+  if (test_resize(nsevent, window, x, y))
+    return FALSE;
 
   /* Apply any window filters. */
   if (GDK_IS_WINDOW (window))