Bug 127080 [Field Assist] widget disposed error on proposal insertion
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
private boolean scrollbarClicked = false;
			public void handleEvent(final Event e) {
				
				
				if (e.type == SWT.FocusOut) {
					scrollbarClicked = false;
					/*
					 * Ignore this event if it's only happening because focus is
					 * moving between the popup shells, their controls, or a
					 * scrollbar. Do this in an async since the focus is not
					 * actually switched when this event is received.
					 */
					e.display.asyncExec(new Runnable() {
						public void run() {
							if (isValid()) {
								if (scrollbarClicked
										|| hasFocus()
										|| (infoPopup != null && infoPopup
												.hasFocus()))
									return;
								
								
								
								
								Shell activeShell = e.display.getActiveShell();
								if (activeShell == getShell()