Bug 192633 [FieldAssist] auto-activated proposal popup should be closed when trigger character is removed
I20070608-1718 Auto-activated proposal popup should be closed when trigger character is removed. Steps: - open Find/Replace dialog, activate regex - type "\" or "\r" - when proposals appear, press Backspace until field is empty again Was: Proposals stay up Expected: Proposals should disappear when the triggering character is removed. This is also what happens in the Java Editor.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* 
	 * @since 3.3
	 * @see org.eclipse.jface.fieldassist.IContentProposalListener2
	 */
	public void addContentProposalListener(IContentProposalListener2 listener) {
		proposalListeners2.add(listener);
	}
	/**
	 * Remove the specified listener from the list of content proposal listeners
	 * that are notified when a content proposal popup is opened or closed.
	 * </p>
	 * 
	 * @param listener
	 *            the IContentProposalListener2 to be removed as a listener.
	 *            Must not be <code>null</code>. If the listener has not
	 *            already been registered, this method has no effect.
	 * 
	 * @since 3.3
	 * @see org.eclipse.jface.fieldassist.IContentProposalListener2
	 */
	public void removeContentProposalListener(IContentProposalListener2 listener) {
		proposalListeners2.remove(listener);
	}
	/*
	 * Add our listener to the control. Debug information to be left in until
	 * this support is stable on all platforms.
	 */
	private void addControlListener(Control control) {
		if (DEBUG) {
			System.out