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
&& !isExpandable((Item) widget, null, widget.getData())) {
				return;
			}
			createChildren(widget);
			if (widget instanceof Item) {
				setExpanded((Item) widget, true);
			}
			if (level == ALL_LEVELS || level > 1) {
				Item[] children = getChildren(widget);
				if (children != null) {
					int newLevel = (level == ALL_LEVELS ? ALL_LEVELS
							: level - 1);
					for (int i = 0; i < children.length; i++) {
						internalExpandToLevel(children[i], newLevel);
					}
				}
			}
		}
	}
	/**
	 * Non-recursively tries to find the given element as a child of the given
	 * parent (item or tree).
	 * 
	 * @param parent
	 *            the parent item
	 * @param element
	 *            the element
	 * @return Widget
	 */
	private Widget internalFindChild(Widget parent, Object element) {