Bug 256656 [FieldAssist] cancel auto activation of proposal popup when caret moved
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* check for whether the info popup has focus.
		 */
		private boolean hasFocus() {
			if (!isValid()) {
				return false;
			}
			if (getShell().isFocusControl() || proposalTable.isFocusControl()) {
				return true;
			}
			if (infoPopup != null && infoPopup.hasFocus()) {
				return true;
			}
			return false;
		}
		/*
		 * Return the current selected proposal.
		 */
		private IContentProposal getSelectedProposal() {
			if (isValid()) {
				int i = proposalTable.getSelectionIndex();
				if (proposals == null || i < 0 || i >= proposals.length) {
					return null;
				}
				return proposals[i];
			}
			return null;
		}
		/*
		 * Select the proposal at the given index.
		 */