Fridge: Added Delete Last button.

src/server/gwt/src/se/chalmers/cs/gf/gwt/client/FridgeApp.java

@@ -170,6 +170,11 @@ public class FridgeApp implements EntryPoint {
 
 	protected Widget createButtonPanel () {
 		Panel buttons = new HorizontalPanel();
+		buttons.add(new Button("Delete last", new ClickListener () {
+			public void onClick(Widget sender) {
+				textPanel.deleteLast();
+			}
+		}));
 		buttons.add(new Button("Clear", new ClickListener () {
 			public void onClick(Widget sender) {
 				clear();

src/server/gwt/src/se/chalmers/cs/gf/gwt/client/FridgeTextPanel.java

@@ -63,6 +63,14 @@ public class FridgeTextPanel extends Composite {
 		fireChange();
 	}
 
+	public void deleteLast() {
+		int c = mainPanel.getWidgetCount();
+		if (c > 0) {
+			mainPanel.remove(c-1);
+			fireChange();
+		}
+	}
+	
 	protected void fireChange() {
 		listeners.fireChange(this);
 	}