#7 Application shutdown disposing fix

core/src/cz/nic/tablexia/TablexiaApplication.java

@@ -153,9 +153,10 @@ public abstract class TablexiaApplication implements ApplicationListener {
      * @param screen new screen to change for
      */
     public void setScreen(AbstractTablexiaScreen<?> screen) {
-        processLastScreen(this.screen);
+        lastScreen = this.screen;
         this.screen = screen;
-        processNewScreen(this.screen);
+        processLastScreen();
+        processNewScreen(screen);
     }
 
     /**
@@ -200,7 +201,7 @@ public abstract class TablexiaApplication implements ApplicationListener {
                 new Runnable() {
                     @Override
                     public void run() {
-                        processLastScreen(lastScreen);
+                        processLastScreen();
                     }
                 },
 
@@ -233,7 +234,7 @@ public abstract class TablexiaApplication implements ApplicationListener {
         }
     }
 
-    private void processLastScreen(AbstractTablexiaScreen<?> lastScreen) {
+    private void processLastScreen() {
         if (lastScreen != null) {
             inputMultiplexer.removeProcessor(lastScreen.getInputProcessor());
             lastScreen.hide();