Fix a compatibility problem

It turns out that my attempt at handling Super, Hyper and Meta better
is causing problems, mostly because Alt and Meta are commonly colocated
in the modmap, and apps do a check for the Alt modifier regularly.

See e.g bug 607697.

docs/reference/gdk/gdk-sections.txt

@@ -1006,6 +1006,7 @@ gdk_keymap_get_entries_for_keycode
 gdk_keymap_get_direction
 gdk_keymap_have_bidi_layouts
 gdk_keymap_get_caps_lock_state
+gdk_keymap_add_virtual_modifiers
 gdk_keymap_map_virtual_modifiers
 
 <SUBSECTION>

gdk/gdk.symbols

@@ -852,6 +852,7 @@ gdk_keymap_have_bidi_layouts
 gdk_keymap_get_caps_lock_state
 gdk_keymap_lookup_key
 gdk_keymap_translate_keyboard_state
+gdk_keymap_add_virtual_modifiers
 gdk_keymap_map_virtual_modifiers
 gdk_keyval_convert_case
 gdk_keyval_from_name

gdk/gdkkeys.h

@@ -108,6 +108,8 @@ gboolean       gdk_keymap_get_entries_for_keycode  (GdkKeymap           *keymap,
 PangoDirection gdk_keymap_get_direction            (GdkKeymap           *keymap);
 gboolean       gdk_keymap_have_bidi_layouts        (GdkKeymap           *keymap);
 gboolean       gdk_keymap_get_caps_lock_state      (GdkKeymap           *keymap);
+void           gdk_keymap_add_virtual_modifiers    (GdkKeymap           *keymap,
+                                                    GdkModifierType     *state);
 gboolean       gdk_keymap_map_virtual_modifiers    (GdkKeymap           *keymap,
                                                     GdkModifierType     *state);
 

gdk/quartz/gdkkeys-quartz.c

@@ -652,6 +652,13 @@ gdk_keymap_translate_keyboard_state (GdkKeymap       *keymap,
   return TRUE;
 }
 
+void
+gdk_keymap_add_virtual_modifiers (GdkKeymap       *keymap,
+                                  GdkModifierType *state)
+{
+  /* FIXME: For now, we've mimiced the Windows backend. */
+}
+
 gboolean
 gdk_keymap_map_virtual_modifiers (GdkKeymap       *keymap,
                                   GdkModifierType *state)

gdk/win32/gdkkeys-win32.c

@@ -872,6 +872,12 @@ gdk_keymap_translate_keyboard_state (GdkKeymap       *keymap,
   return tmp_keyval != GDK_VoidSymbol;
 }
 
+void
+gdk_keymap_add_virtual_modifiers (GdkKeymap       *keymap,
+                                  GdkModifierType *state)
+{
+}
+
 gboolean
 gdk_keymap_map_virtual_modifiers (GdkKeymap       *keymap,
                                   GdkModifierType *state)

gdk/x11/gdkevents-x11.c

@@ -636,7 +636,7 @@ translate_key_event (GdkDisplay *display,
 				       &event->key.keyval,
                                        NULL, NULL, &consumed);
    state = event->key.state & ~consumed;
-   _gdk_keymap_add_virtual_modifiers (keymap, &state);
+   _gdk_keymap_add_virtual_modifiers_compat (keymap, &state);
    event->key.state |= state;
 
   event->key.is_modifier = _gdk_keymap_key_is_modifier (keymap, event->key.hardware_keycode);

gdk/x11/gdkkeys-x11.c

@@ -1657,8 +1657,8 @@ _gdk_x11_get_group_for_state (GdkDisplay      *display,
 }
 
 void
-_gdk_keymap_add_virtual_modifiers (GdkKeymap       *keymap,
-				   GdkModifierType *modifiers)
+_gdk_keymap_add_virtual_modifiers_compat (GdkKeymap       *keymap,
+				          GdkModifierType *modifiers)
 {
   GdkKeymapX11 *keymap_x11;
   int i;
@@ -1666,6 +1666,51 @@ _gdk_keymap_add_virtual_modifiers (GdkKeymap       *keymap,
   keymap = GET_EFFECTIVE_KEYMAP (keymap);
   keymap_x11 = GDK_KEYMAP_X11 (keymap);
 
+  for (i = 3; i < 8; i++)
+    {
+      if ((1 << i) & *modifiers)
+        {
+	  if (keymap_x11->modmap[i] & GDK_MOD1_MASK)
+	    *modifiers |= GDK_MOD1_MASK;
+	  else if (keymap_x11->modmap[i] & GDK_SUPER_MASK)
+	    *modifiers |= GDK_SUPER_MASK;
+	  else if (keymap_x11->modmap[i] & GDK_HYPER_MASK)
+	    *modifiers |= GDK_HYPER_MASK;
+	  else if (keymap_x11->modmap[i] & GDK_META_MASK)
+	    *modifiers |= GDK_META_MASK;
+        }
+    }
+}
+
+/**
+ * gdk_keymap_add_virtual_modifiers:
+ * @keymap: a #GdkKeymap
+ * @modifiers: pointer to the modifier mask to change
+ *
+ * Adds virtual modifiers (i.e. Super, Hyper and Meta) which correspond
+ * to the real modifiers (i.e Mod2, Mod3, ...) in @modifiers.
+ * are set in @state to their non-virtual counterparts (i.e. Mod2,
+ * Mod3,...) and set the corresponding bits in @modifiers.
+ *
+ * GDK already does this before delivering key events, but for
+ * compatibility reasons, it only sets the first virtual modifier
+ * it finds, whereas this function sets all matching virtual modifiers.
+ *
+ * This function is useful when matching key events against
+ * accelerators.
+ *
+ * Since: 2.20
+ */
+void
+gdk_keymap_add_virtual_modifiers (GdkKeymap       *keymap,
+			          GdkModifierType *modifiers)
+{
+  GdkKeymapX11 *keymap_x11;
+  int i;
+
+  keymap = GET_EFFECTIVE_KEYMAP (keymap);
+  keymap_x11 = GDK_KEYMAP_X11 (keymap);
+
   for (i = 3; i < 8; i++)
     {
       if ((1 << i) & *modifiers)

gtk/gtkkeyhash.c

@@ -404,6 +404,7 @@ _gtk_key_hash_lookup (GtkKeyHash      *key_hash,
   gdk_keymap_translate_keyboard_state (key_hash->keymap,
 				       hardware_keycode, state, group,
 				       &keyval, &effective_group, &level, &consumed_modifiers);
+  gdk_keymap_add_virtual_modifiers (key_hash->keymap, &state);
 
   GTK_NOTE (KEYBINDINGS,
 	    g_message ("Looking up keycode = %u, modifiers = 0x%04x,\n"