TreeUi: expand node when enqueued for update

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

@@ -2956,7 +2956,9 @@ public class AbstractTreeUi {
 
 
     if (myTree.isExpanded(getPathFor(toExpand)) && !myUnbuiltNodes.contains(toExpand)) {
-      processNodeActionsIfReady(toExpand);
+      if (!areChildrenToBeUpdated(toExpand)) {
+        processNodeActionsIfReady(toExpand);
+      }
     }
     else {
       if (!myUnbuiltNodes.contains(toExpand)) {
@@ -2968,6 +2970,9 @@ public class AbstractTreeUi {
     }
   }
 
+  private boolean areChildrenToBeUpdated(DefaultMutableTreeNode node) {
+    return getUpdater().isEnqueuedToUpdate(node) || isUpdatingParent(node);
+  }
 
   private String asString(DefaultMutableTreeNode node) {
     if (node == null) return null;

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

@@ -316,4 +316,13 @@ public class AbstractTreeUpdater implements Disposable, Activatable {
   public void flush() {
     myUpdateQueue.sendFlush();
   }
+
+  public boolean isEnqueuedToUpdate(DefaultMutableTreeNode node) {
+    Iterator<TreeUpdatePass> nodes = myNodeQueue.iterator();
+    while (nodes.hasNext()) {
+      TreeUpdatePass each = nodes.next();
+      if (each.willUpdate(node)) return true;
+    }
+    return false;
+  }
 }

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

@@ -79,4 +79,9 @@ public class TreeUpdatePass {
   public String toString() {
     return "TreUpdatePass node=" + myNode + " stamp=" + myUpdateStamp + " expired=" + myExpired + " currentNode=" + myCurrentNode + " allocation=" + myAllocation;
   }
+
+  public boolean willUpdate(@NotNull DefaultMutableTreeNode node) {
+    @NotNull DefaultMutableTreeNode currentNode = myCurrentNode != null ? myCurrentNode : myNode;
+    return node.isNodeAncestor(currentNode);
+  }
 }