IDEA-101953 File not showing under project pane / Missing files (blank...

IDEA-101953 File not showing under project pane / Missing files (blank entries) in project view after the "Mark As ..." action

platform/platform-api/src/com/intellij/ide/util/treeView/AbstractTreeUi.java

@@ -2708,7 +2708,7 @@ public class AbstractTreeUi {
         final LoadedChildren loaded = new LoadedChildren(loadedElements);
         for (final Object each : loadedElements) {
           NodeDescriptor existingDesc = getDescriptorFrom(getNodeForElement(each, true));
-          final NodeDescriptor eachChildDescriptor = existingDesc != null ? existingDesc : getTreeStructure().createDescriptor(each, updateInfo.getDescriptor());
+          final NodeDescriptor eachChildDescriptor = isValid(existingDesc) ? existingDesc : getTreeStructure().createDescriptor(each, updateInfo.getDescriptor());
           execute(new TreeRunnable("AbstractTreeUi.queueBackgroundUpdate") {
             @Override
             public void perform() {