Bug 125955 [Field Assist] - StringIndexOutOfBoundsException when backspacing out of a filter
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
/*
		 * The listener we will install on the target control.
		 */
		private final class TargetControlListener implements Listener {
			
			public void handleEvent(Event e) {
				if (!isValid())
					return;
				
				
				
				if (!(e.type == SWT.KeyDown || e.type == SWT.Traverse)) {
					close();
					return;
				}
				
				
				
				if (e.type == SWT.Traverse) {
					e.detail = SWT.TRAVERSE_NONE;
					e.doit = true;
				}
				char key = e.character;
				
				if (key == 0) {
					int newSelection = proposalTable.getSelectionIndex();
					int visibleRows = (proposalTable.getSize().y / proposalTable