Bug 161805 [Viewers] JFace TreeViewer collapses node when sibbling removed
3.2 1. Use the Eclipse Wizard to produce a plugin with a tree viewer view. 2. Paste the modified SampleView.java - this looks like the left part of the attached screenshot 3. Click on the top node Parent1 and type - 4. TreeViewer.remove is called to remove Parent 1. TreeViewer.refresh is called - this looks like the right part of the attached screenshot Wrong: node Parent 4 is now collapsed. Expectation Parent 4 is still expanded. Is there any workaround? Am I misusing your API? Note. The snippet is almost identical to the code generated by PDE for plugin / view / Tree Viewer. Here is the extra code in createPartControl: viewer.getTree().addKeyListener(new KeyListener() { public void keyReleased(KeyEvent e) { // TODO Auto-generated method stub } public void keyPressed(KeyEvent e) { if (e.character == '-') { TreeParent parent = (TreeParent) ((IStructuredSelection)viewer.getSelection()).toArray()[0]; parent.getParent().removeChild(parent); viewer.refresh(); } if (e.character == '+') { TreeParent parent = (TreeParent) ((IStructuredSelection)viewer.getSelection()).toArray()[0]; parent.addChild(new TreeParent(new Date().toString())); } } });
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
if (w != null) {
			internalCollapseToLevel(w, level);
		}
	}
	/**
	 * Creates all children for the given widget.
	 * <p>
	 * The default implementation of this framework method assumes that
	 * <code>widget.getData()</code> returns the element corresponding to the
	 * node. Note: the node is not visually expanded! You may have to call
	 * <code>parent.setExpanded(true)</code>.
	 * </p>
	 * 
	 * @param widget
	 *            the widget
	 */
	protected void createChildren(final Widget widget) {
		final Item[] tis = getChildren(widget);
		if (tis != null && tis.length > 0) {
			Object data = tis[0].getData();
			if (data != null) {
				return; 
			}
		}
		BusyIndicator.showWhile(widget.getDisplay(), new Runnable() {
			public void run() {
				
				
				if (tis != null) {
					for (int i = 0; i < tis.length; i++) {