Lowered the priority of the old command handler event because a number of plugins were using this event incorrectly. A new event, the command preprocesser event, has replaced the previous function of the original command event.

src/main/java/org/bukkit/event/player/PlayerListener.java

@@ -43,9 +43,7 @@ public class PlayerListener implements Listener {
     }
 
     /**
-     * Called when a player attempts to use a command. Avoid using this
-     * when possible -- it won't be removed, but this is not how you
-     * handle commands.
+     * Called when a player attempts to use a command.
      *
      * @param event Relevant event details
      */
@@ -53,6 +51,15 @@ public class PlayerListener implements Listener {
     public void onPlayerCommand(PlayerChatEvent event) {
     }
 
+    /**
+     * Called early in the command handling process. This event is only
+     * for very exceptional cases and you should not normally use it.
+     *
+     * @param event Relevant event details
+     */
+    public void onPlayerCommandPreprocess(PlayerChatEvent event) {
+    }
+
     /**
      * Called when a player attempts to move location in a world
      *