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
createChildren(pw);
					Object element = internalToElement(elementOrPath);
					w = internalFindChild(pw, element);
					if (expand && pw instanceof Item) {
						
						Item item = (Item) pw;
						LinkedList toExpandList = new LinkedList();
						while (item != null && !getExpanded(item)) {
							toExpandList.addFirst(item);
							item = getParentItem(item);
						}
						for (Iterator it = toExpandList.iterator(); it
								.hasNext();) {
							Item toExpand = (Item) it.next();
							setExpanded(toExpand, true);
						}
					}
				}
			}
		}
		return w;
	}
	/**
	 * If the argument is a tree path, returns its last segment, otherwise
	 * return the argument
	 * 
	 * @param elementOrPath
	 *            an element or a tree path
	 * @return the element, or the last segment of the tree path
	 */