Ignore PlayerInteracts with off-hand item.

Fixes WORLDEDIT-3437
The API will need to be changed to accomodate off-hand tools etc

worldedit-bukkit/build.gradle

@@ -8,7 +8,7 @@ repositories {
 dependencies {
     compile project(':worldedit-core')
     compile 'com.sk89q:dummypermscompat:1.8'
-    compile 'org.bukkit:bukkit:1.8.8-R0.1-SNAPSHOT' // zzz
+    compile 'org.bukkit:bukkit:1.9.4-R0.1-SNAPSHOT' // zzz
     testCompile 'org.mockito:mockito-core:1.9.0-rc1'
 }
 

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/WorldEditListener.java

@@ -37,6 +37,7 @@ import org.bukkit.event.block.Action;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 import org.bukkit.event.player.PlayerGameModeChangeEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
 
 /**
  * Handles all events thrown in relation to a Player
@@ -116,6 +117,15 @@ public class WorldEditListener implements Listener {
             return;
         }
 
+        try {
+            if (event.getHand() == EquipmentSlot.OFF_HAND) {
+                return; // TODO api needs to be able to get either hand depending on event
+                // for now just ignore all off hand interacts
+            }
+        } catch (NoSuchMethodError ignored) {
+        } catch (NoSuchFieldError ignored) {
+        }
+
         final LocalPlayer player = plugin.wrapPlayer(event.getPlayer());
         final World world = player.getWorld();
         final WorldEdit we = plugin.getWorldEdit();