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
* 
	 * @since 3.2
	 */
	public void setExpandedTreePaths(TreePath[] treePaths) {
		assertElementsNotNull(treePaths);
		final IElementComparer comparer = getComparer();
		IElementComparer treePathComparer = new IElementComparer() {
			public boolean equals(Object a, Object b) {
				return ((TreePath) a).equals(((TreePath) b), comparer);
			}
			public int hashCode(Object element) {
				return ((TreePath) element).hashCode(comparer);
			}
		};
		CustomHashtable expandedTreePaths = new CustomHashtable(
				treePaths.length * 2 + 1, treePathComparer);
		for (int i = 0; i < treePaths.length; ++i) {
			TreePath treePath = treePaths[i];
			
			
			
			
			internalExpand(treePath, false);
			expandedTreePaths.put(treePath, treePath);
		}
		
		
		
		
		internalSetExpandedTreePaths(expandedTreePaths, getControl(),