Bug 182505 [FieldAssist] API - ContentProposalAdapter needs hasProposalPopupFocus() method
Please implement a method ContentProposalAdapter.hasProposalPopupFocus() like org.eclipse.jface.text.contentassist.ContentAssistant.hasProposalPopupFocus(). The method should return a boolean whether the content assistant proposal popup has the focus or not.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
* Return an empty array. Used so that something always shows in the
		 * proposal popup, even if no proposal provider was specified.
		 */
		private IContentProposal[] getEmptyProposalArray() {
			return new IContentProposal[0];
		}
		/*
		 * Answer true if the popup is valid, which means the table has been
		 * created and not disposed.
		 */
		private boolean isValid() {
			return proposalTable != null && !proposalTable.isDisposed();
		}
		/*
		 * Return whether the receiver has focus.
		 */
		private boolean hasFocus() {
			if (!isValid()) {
				return false;
			}
			return getShell().isFocusControl()
					|| proposalTable.isFocusControl();
		}
		/*
		 * Return the current selected proposal.
		 */
		private IContentProposal getSelectedProposal() {
			if (isValid()) {
				int i = proposalTable.getSelectionIndex();
				if (proposals == null || i < 0 || i >= proposals.length) {