[gtk+] Fix handling of GDK_NONE

[Matthias Clasen <matthiasc src gnome org>]

commit 6aa63385789fd28e61eb4de05312e2f1316cf6d0
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 3 21:38:54 2009 -0400

    Fix handling of GDK_NONE
    
    Don't intern "NONE" and warn if GDK_NONE is converted to an
    X atom. Problem pointed out in bug 580511.
---
 gdk/x11/gdkproperty-x11.c  |   16 +++++++++-------
 gdk/x11/gdkselection-x11.c |    5 ++++-
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/gdk/x11/gdkproperty-x11.c b/gdk/x11/gdkproperty-x11.c
index 36b8e9f..116f47d 100644
--- a/gdk/x11/gdkproperty-x11.c
+++ b/gdk/x11/gdkproperty-x11.c
@@ -44,7 +44,7 @@ static GHashTable *virtual_atom_hash;
 
 static const gchar xatoms_string[] = 
   /* These are all the standard predefined X atoms */
-  "NONE\0"
+  "\0"  /* leave a space for None, even though it is not a predefined atom */
   "PRIMARY\0"
   "SECONDARY\0"
   "ARC\0"
@@ -120,12 +120,12 @@ static const gchar xatoms_string[] =
 ;
 
 static const gint xatoms_offset[] = {
-    0,   5,  13,  23,  27,  32,  39,  48,  57,  64,  76,  88, 
-  100, 112, 124, 136, 148, 160, 169, 174, 182, 189, 195, 205, 
-  222, 236, 249, 262, 278, 291, 305, 317, 324, 333, 340, 351, 
-  360, 378, 391, 404, 412, 428, 442, 456, 466, 477, 487, 497, 
-  511, 525, 537, 549, 568, 588, 605, 623, 636, 645, 656, 663, 
-  674, 685, 695, 702, 712, 724, 734, 745, 754, 771
+    0,   1,   9,  19,  23,  28,  35,  44,  53,  60,  72,  84,
+   96, 108, 120, 132, 144, 156, 165, 170, 178, 185, 189, 201,
+  218, 232, 245, 258, 274, 287, 301, 313, 320, 329, 336, 347,
+  356, 374, 387, 400, 408, 424, 438, 452, 462, 473, 483, 493,
+  507, 521, 533, 545, 564, 584, 601, 619, 632, 641, 652, 659,
+  670, 681, 691, 698, 708, 720, 730, 741, 750, 767
 };
 
 #define N_CUSTOM_PREDEFINED 1
@@ -189,6 +189,7 @@ gdk_x11_atom_to_xatom_for_display (GdkDisplay *display,
   Atom xatom = None;
   
   g_return_val_if_fail (GDK_IS_DISPLAY (display), None);
+  g_return_val_if_fail (atom != GDK_NONE, None);
 
   if (display->closed)
     return None;
@@ -292,6 +293,7 @@ gdk_x11_xatom_to_atom_for_display (GdkDisplay *display,
   GdkAtom virtual_atom = GDK_NONE;
   
   g_return_val_if_fail (GDK_IS_DISPLAY (display), GDK_NONE);
+  g_return_val_if_fail (xatom != None, GDK_NONE);
 
   if (display->closed)
     return GDK_NONE;
diff --git a/gdk/x11/gdkselection-x11.c b/gdk/x11/gdkselection-x11.c
index fd482e2..6045dad 100644
--- a/gdk/x11/gdkselection-x11.c
+++ b/gdk/x11/gdkselection-x11.c
@@ -404,7 +404,10 @@ gdk_selection_send_notify_for_display (GdkDisplay       *display,
   xevent.requestor = requestor;
   xevent.selection = gdk_x11_atom_to_xatom_for_display (display, selection);
   xevent.target = gdk_x11_atom_to_xatom_for_display (display, target);
-  xevent.property = gdk_x11_atom_to_xatom_for_display (display, property);
+  if (property == GDK_NONE)
+    xevent.property = None;
+  else
+    xevent.property = gdk_x11_atom_to_xatom_for_display (display, property);
   xevent.time = time;
 
   _gdk_send_xevent (display, requestor, False, NoEventMask, (XEvent*) & xevent);