Bug 125955 [Field Assist] - StringIndexOutOfBoundsException when backspacing out of a filter
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
if (autoActivateString.indexOf(e.character) >= 0) {
								autoActivated = true;
							}
							
							
							
						} else if (triggerKeyStroke == null
								&& Character.isLetterOrDigit(e.character)) {
							autoActivated = true;
						}
						/*
						 * When autoactivating, we check the autoactivation
						 * delay.
						 */
						if (autoActivated) {
							e.doit = propagateKeys;
							if (popup == null) {
								if (autoActivationDelay > 0) {
									Runnable runnable = new Runnable() {
										public void run() {
											try {
												Thread
														.sleep(autoActivationDelay);
											} catch (InterruptedException e) {
											}
											if (!isValid())
												return;
											getControl().getDisplay().syncExec(
													new Runnable() {
														public void run() {