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
* 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.
		 */
		private void selectProposal(int index) {
			Assert
					.isTrue(index >= 0,
							"Proposal index should never be negative"); 
			if (!isValid() || proposals == null || index >= proposals.length) {
				return;
			}
			proposalTable.setSelection(index);
			proposalTable.showSelection();
			showProposalDescription(proposals[index].getDescription());
		}
		/**
		 * Opens this ContentProposalPopup. This method is extended in order to
		 * add the control listener when the popup is opened and to invoke the
		 * secondary popup if applicable.