javafx: accept any root tag type (e.g. to be included in another page, @see DataAppClient)

(cherry picked from commit 55c9a8ad8675f841b23485f4ea139d87702e05de)

plugins/javaFX/javaFX-CE/testSrc/org/jetbrains/plugins/javaFX/fxml/JavaFXHighlightingTest.java

@@ -65,6 +65,10 @@ public class JavaFXHighlightingTest extends LightCodeInsightFixtureTestCase {
     doTest();
   }
 
+  public void testRootTagCoercedUnchecked() throws Exception {
+    doTest();
+  }
+
   public void testStaticProperties() throws Exception {
     doTest();
   }

plugins/javaFX/src/org/jetbrains/plugins/javaFX/fxml/JavaFxPsiUtil.java

@@ -436,13 +436,10 @@ public class JavaFxPsiUtil {
   }
 
   public static String isClassAcceptable(@Nullable XmlTag parentTag, final PsiClass aClass) {
+    if (parentTag == null) {
+      return null;
+    }
     if (aClass != null && aClass.isValid()) {
-      if (parentTag == null) {
-        if (!InheritanceUtil.isInheritor(aClass, false, JavaFxCommonClassNames.JAVAFX_SCENE_NODE)) {
-          return unableToCoerceMessage(aClass, JavaFxCommonClassNames.JAVAFX_SCENE_NODE);
-        }
-        return null;
-      }
       final XmlElementDescriptor descriptor = parentTag.getDescriptor();
       if (descriptor instanceof JavaFxPropertyElementDescriptor) {
         final PsiElement declaration = descriptor.getDeclaration();

plugins/javaFX/testData/highlighting/rootTagCoercedUnchecked.fxml

@@ -0,0 +1,3 @@
+<?import javafx.scene.control.*?>
+
+<Tab text="Tab Title" xmlns:fx="http://javafx.com/fxml"/>