#249 Fixed back button display state changing

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

@@ -177,17 +177,21 @@ public class Tablexia extends TablexiaApplication {
     private void setBackButtonVisibility(boolean hasBackButton) {
         backButtonVisibility = hasBackButton;
         if (backButton != null) {
-            if (hasBackButton && !backButton.isVisible()) {
-                backButton.addAction(Actions.alpha(0f));
-                backButton.setVisible(true);
-                backButton.addAction(Actions.sequence(Actions.fadeIn(SHOW_BACK_BUTTON_DURATION)));
-            } else if (backButton.isVisible()){
-                backButton.addAction(Actions.sequence(Actions.fadeOut(HIDE_BACK_BUTTON_DURATION), Actions.run(new Runnable() {
-                    @Override
-                    public void run() {
-                        backButton.setVisible(false);
-                    }
-                })));
+            if (hasBackButton) {
+                if (!backButton.isVisible()) {
+                    backButton.addAction(Actions.alpha(0f));
+                    backButton.setVisible(true);
+                    backButton.addAction(Actions.sequence(Actions.fadeIn(SHOW_BACK_BUTTON_DURATION)));
+                }
+            } else{
+                if (backButton.isVisible()) {
+                    backButton.addAction(Actions.sequence(Actions.fadeOut(HIDE_BACK_BUTTON_DURATION), Actions.run(new Runnable() {
+                        @Override
+                        public void run() {
+                            backButton.setVisible(false);
+                        }
+                    })));
+                }
             }
         }
     }