Use form animation helpers in demo screenshot test

Author: shai-almog

docs/demos/common/pom.xml

@@ -19,12 +19,6 @@
             <scope>provided</scope>
         </dependency>
 
-        <dependency>
-            <groupId>xalan</groupId>
-            <artifactId>serializer</artifactId>
-            <version>2.7.2</version>
-        </dependency>
-
         <!-- INJECT DEPENDENCIES -->
     </dependencies>
 

docs/demos/common/src/test/java/com/codenameone/developerguide/animations/AnimationDemosScreenshotTest.java

@@ -154,7 +154,7 @@ private void waitForFormReady(Form form) {
     private void waitForHost(Form host) {
         long deadline = System.currentTimeMillis() + FORM_TIMEOUT_MS;
         while (Display.getInstance().getCurrent() != host) {
-            Display.getInstance().animate();
+            animateCurrentForm();
             TestUtils.waitFor(50);
             if (System.currentTimeMillis() > deadline) {
                 fail("Timed out waiting to return to host form.");
@@ -187,7 +187,7 @@ private void returnToHost(Form demoForm, Form host) {
                 unwindForm(active, host);
             }
 
-            Display.getInstance().animate();
+            animateCurrentForm();
             TestUtils.waitFor(120);
         }
 
@@ -220,6 +220,13 @@ private Form currentForm() {
         return (current instanceof Form) ? (Form) current : null;
     }
 
+    private void animateCurrentForm() {
+        Form current = currentForm();
+        if (current != null) {
+            current.animate();
+        }
+    }
+
     private void triggerAnimationIfNeeded(Demo demo, Form form) {
         if (demo == null || form == null) {
             return;