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
/**
	 * Returns the SWT child items for the given SWT widget.
	 * 
	 * @param widget
	 *            the widget
	 * @return the child items
	 */
	protected abstract Item[] getChildren(Widget widget);
	/**
	 * Get the child for the widget at index. Note that the default
	 * implementation is not very effecient and should be overridden if this
	 * class is implemented.
	 * 
	 * @param widget
	 *            the widget to check
	 * @param index
	 *            the index of the widget
	 * @return Item or <code>null</code> if widget is not a type that can
	 *         contain items.
	 * 
	 * @throws ArrayIndexOutOfBoundsException
	 *             if the index is not valid.
	 * @since 3.1
	 */
	protected Item getChild(Widget widget, int index) {
		return getChildren(widget)[index];
	}
	/**
	 * Returns whether the given SWT item is expanded or collapsed.
	 *