Bug 132798 [Field Assist] - Pressing Backspace at offset 0 should not reload field assist popup
N20060322-0010. After migrating the Find/Replace dialog to the new field assist support I found the following blooper: pressing the Backspace key at offset 0 reloads the field assist popup. Test Case: 1. in a text editor press Ctrl+F 2. enable regex search 3. in the Find filed press Ctrl+Space 4. continuously press Backspace ==> each time the proposal list is reloaded.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
/**
	 * Set the boolean flag that determines whether the adapter is enabled.
	 * 
	 * @param enabled
	 *            <code>true</code> if the adapter is enabled and responding
	 *            to user input, <code>false</code> if it is ignoring user
	 *            input.
	 * 
	 */
	public void setEnabled(boolean enabled) {
		
		
		if (isEnabled && !enabled) {
			if (popup != null) {
				popup.close();
			}
		}
		isEnabled = enabled;
	}
	/**
	 * Add the specified listener to the list of content proposal listeners that
	 * are notified when content proposals are chosen.
	 * </p>
	 * 
	 * @param listener
	 *            the IContentProposalListener to be added as a listener. Must
	 *            not be <code>null</code>. If an attempt is made to register
	 *            an instance which is already registered with this instance,
	 *            this method has no effect.
	 *