added support for "Umlaute" and exception-handle for block-insert

src/main/java/edu/mit/blocks/codeblocks/BlockLink.java

@@ -149,7 +149,8 @@ public class BlockLink {
             // the plug shouldn't be connected by the time we reach here.  This
             // exception will only be thrown if the plug is connected even
             // after any insertion-esq links were broken above
-            throw new RuntimeException("trying to link a plug that's already connected somewhere.");
+        	
+        	throw new RuntimeException("trying to link a plug that's already connected somewhere.");
         }
 
         // actually form the connection

src/main/java/edu/mit/blocks/codeblocks/CommandRule.java

@@ -48,7 +48,13 @@ public class CommandRule implements LinkRule, WorkspaceListener {
                 }
 
                 link = BlockLink.getBlockLink(workspace, top, bottom, top.getAfterConnector(), bottom.getBeforeConnector());
-                link.connect();
+                try{
+                	link.connect();
+                }catch (RuntimeException re) {
+                	//added by letsgoING
+                	//No Output needed -> it works
+                	//System.out.println("catched Exeption: "+ re);
+                }
             }
         }
     }

src/main/java/edu/mit/blocks/codeblockutil/LabelWidget.java

@@ -381,7 +381,7 @@ public abstract class LabelWidget extends JComponent {
      * BlockLabelTextField is a java JtextField that internally handles various events
      * and provides the semantic to interface with the user.  Unlike typical JTextFields,
      * the blockLabelTextField allows clients to only enter certain keys board input.
-     * It also reacts to enters and escapse by delegating the KeyEvent to the parent
+     * It also reacts to enters and escape by delegating the KeyEvent to the parent
      * RenderableBlock.
      */
     private class BlockLabelTextField extends JTextField implements MouseListener, DocumentListener, FocusListener, ActionListener {
@@ -397,7 +397,9 @@ public abstract class LabelWidget extends JComponent {
             'G', 'H', 'J', 'K', 'L', 'Z', 'X', 'C', 'V', 'B', 'N', 'M',
             '\'', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+',
             '-', '=', '{', '}', '|', '[', ']', '\\', ' ',
-            ':', '"', ';', '\'', '<', '>', '?', ',', '.', '/', '`', '~'};
+            ':', '"', ';', '\'', '<', '>', '?', ',', '.', '/', '`', '~',
+            'ä', 'ö', 'ü', 'Ä', 'Ö', 'Ü', 'ß'};
+        
         /** These Key inputs are processed by all this text field */
         @SuppressWarnings("deprecation")
 		private final int[] validMasks = {KeyEvent.VK_BACK_SPACE,