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
return null;
    }
    /**
     * Sets the auto-expand level. The value 0 means that there is no
     * auto-expand; 1 means that top-level elements are expanded, but not their
     * children; 2 means that top-level elements are expanded, and their
     * children, but not grandchildren; and so on.
     * <p>
     * The value <code>ALL_LEVELS</code> means that all subtrees should be
     * expanded.
     * </p>
     * 
     * @param level
     *           non-negative level, or <code>ALL_LEVELS</code> to expand all
     *           levels of the tree
     */
    public void setAutoExpandLevel(int level) {
        expandToLevel = level;
    }
    /**
     * The <code>AbstractTreeViewer</code> implementation of this method
     * checks to ensure that the content provider is an <code>ITreeContentProvider</code>.
     */
    public void setContentProvider(IContentProvider provider) {
    	
        super.setContentProvider(provider);
    }
    
	protected void assertContentProviderType(IContentProvider provider) {
		Assert.isTrue(provider instanceof ITreeContentProvider || provider instanceof ITreePathContentProvider);