Bug 133599 [FieldAssist] Left and right arrow keys should work with open proposals list
I20060328-0010, worked in M5 In the Find/Replace dialog, enable regex, then type something into the Find field and invoke content assist. Pressing the left or right arrow key now closes the proposals popup. The list should not be closed, but the caret should be moved and the proposals should be recalculated for the new caret position.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* proposal provider. This method returns immediately. That is, it does not
	 * wait for a proposal to be selected.
	 */
	protected void openProposalPopup() {
		if (isValid()) {
			if (popup == null) {
				recordCursorPosition();
				popup = new ContentProposalPopup(null);
				popup.open();
				popup.getShell().addDisposeListener(new DisposeListener() {
					public void widgetDisposed(DisposeEvent event) {
						popup = null;
					}
				});
			}
		}
	}
	/*
	 * A content proposal has been accepted. Update the control contents
	 * accordingly and notify any listeners.
	 * 
	 * @param proposal the accepted proposal
	 */
	private void proposalAccepted(IContentProposal proposal) {
		switch (proposalAcceptanceStyle) {
		case (PROPOSAL_REPLACE):
			setControlContent(proposal.getContent(), proposal
					.getCursorPosition());
			break;
		case (PROPOSAL_INSERT):