Bug 108102 [Viewers] Project expands in wrong working set
I am using "Show->Working Sets" in the package explorer. Some of the working sets contain the same project: Working Set-1: - Project-A - Project-B - Project-C Working Set-2: - Project-B - Project-C - Project-D If I now double-click "Working Set-1.Project-B" "Project-B" in working set "Working Set-2" will be expanded. If the working set "Working Set-2" itself is not expanded it will seem as if nothing happens, but after expanding "Working Set-2" one can see the changed state of the project. Double-clicking "Working Set-2.Project-B" works as expected.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
}
    }
    /**
     * Removes the given elements from this viewer.
     * <p>
     * EXPERIMENTAL.  Not to be used except by JDT.
     * This method was added to support JDT's explorations
     * into grouping by working sets, which requires viewers to support multiple 
     * equal elements.  See bug 76482 for more details.  This support will
     * likely be removed in Eclipse 3.2 in favour of proper support for
     * multiple equal elements. 
     * </p>
     * 
     * @param elementsOrPaths
     *           the elements or element paths to remove
     * @since 3.1
     */
    protected void internalRemove(Object[] elementsOrPaths) {
        Object input = getInput();
        
        
        CustomHashtable parentItems = new CustomHashtable(5);
        for (int i = 0; i < elementsOrPaths.length; ++i) {
            Object element = elementsOrPaths[i];
			if (equals(element, input)) {
                setInput(null);
                return;
            }
            Widget[] childItems = internalFindItems(element);
			for (int j = 0; j < childItems.length; j++) {