Refactored up-with-glass code into a helper function.

src/main/java/com/sk89q/worldedit/LocalPlayer.java

@@ -252,8 +252,7 @@ public abstract class LocalPlayer {
             // Found a ceiling!
             if (!BlockType.canPassThrough(world.getBlock(new Vector(x, y, z)))) {
                 int platformY = Math.max(initialY, y - 3 - clearance);
-                world.setBlockType(new Vector(x, platformY, z), BlockID.GLASS);
+                floatAt(x, platformY + 1, z);
-                setPosition(new Vector(x + 0.5, platformY + 1, z + 0.5));
                 return true;
             }
 
@@ -284,8 +283,7 @@ public abstract class LocalPlayer {
             } else if (y > maxY + 1) {
                 break;
             } else if (y == maxY + 1) {
-                world.setBlockType(new Vector(x, y - 2, z), BlockID.GLASS);
+                floatAt(x, y - 1, z);
-                setPosition(new Vector(x + 0.5, y - 1, z + 0.5));
                 return true;
             }
 
@@ -295,6 +293,18 @@ public abstract class LocalPlayer {
         return false;
     }
 
+    /**
+     * Make the player float in the given blocks.
+     *
+     * @param x The X coordinate of the block to float in
+     * @param y The Y coordinate of the block to float in
+     * @param z The Z coordinate of the block to float in
+     */
+    private void floatAt(int x, int y, int z) {
+        getPosition().getWorld().setBlockType(new Vector(x, y - 1, z), BlockID.GLASS);
+        setPosition(new Vector(x + 0.5, y, z + 0.5));
+    }
+
     /**
      * Get the point of the block that is being stood in.
      *