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 (!getExpanded(parentItem) && getItemCount(parentItem) == 0) {
				
				if (isExpandable(parentItem, null, parentItem.getData())) {
					newItem(parentItem, SWT.NULL, -1);
				} else {
					
					tree.redraw();
				}
			}
		}
	}
	/**
	 * Removes the given elements from this viewer, whenever those elements
	 * appear as children of the given parent.
	 * 
	 * @param elements
	 *            the elements to remove
	 * @since 3.1
	 */
	protected void internalRemove(Object parent, Object[] elements) {
		CustomHashtable toRemove = new CustomHashtable(getComparer());
		for (int i = 0; i < elements.length; i++) {
			toRemove.put(elements[i], elements[i]);
		}
		
		
		CustomHashtable parentItems = new CustomHashtable(5);
		
		Widget[] parentItemArray = findItems(parent);
		for (int i = 0; i < parentItemArray.length; i++) {