Description Steffen Pingel 2009-10-15 15:30:58 EDT

Steps:
1. Enable Window Working Set action group
2. Window > Working Sets > Edit > New
3. Select Plug-ins and Fragments
4. Make a selection
5. Type filter text
6. Clear filter text

The result is that the previous selection is lost.

The code is similar to Mylyn's multi-select combo box implementation that is used in the task editor (bug 292433):

	private class CheckboxFilteredTree extends FilteredTree {

		public CheckboxFilteredTree(Composite parent, int treeStyle, PatternFilter filter) {
			super(parent, treeStyle, filter);
		}

		@Override
		protected TreeViewer doCreateTreeViewer(Composite parent, int style) {
			return new CheckboxTreeViewer(parent, style);
		}

		@Override
		public CheckboxTreeViewer getViewer() {
			return (CheckboxTreeViewer) super.getViewer();
		}

	}
	
To fix it Mylyn manually tracks the selected items and has the following work around:
		
		@Override
		protected WorkbenchJob doCreateRefreshJob() {
			WorkbenchJob job = super.doCreateRefreshJob();
			job.addJobChangeListener(new JobChangeAdapter() {
				@Override
				public void done(IJobChangeEvent event) {
					if (event.getResult() != null && event.getResult().isOK() && !getViewer().getTree().isDisposed()) {
						getViewer().setCheckedElements(selectedValues.toArray());
					}
				}
			});
			return job;
		}