if (createChange == null) return new CompilationUnitChange("", getCompilationUnit());
	protected TextChange createTextChange() throws CoreException {		IFix fix= getFix();		TextChange createChange= fix.createChange();		if (fix instanceof LinkedFix) {			LinkedFix linkedFix= (LinkedFix)fix;						PositionGroup[] positionGroups= linkedFix.getPositionGroups();			for (int i= 0; i < positionGroups.length; i++) {				PositionGroup group= positionGroups[i];				String groupId= group.getGroupId();				ITrackedNodePosition firstPosition= group.getFirstPosition();				ITrackedNodePosition[] positions= group.getPositions();				for (int j= 0; j < positions.length; j++) {					addLinkedPosition(positions[j], positions[j] == firstPosition, groupId);				}				String[] proposals= group.getProposals();				String[] displayStrings= group.getDisplayStrings();				for (int j= 0; j < proposals.length; j++) {					String proposal= proposals[j];					String displayString= displayStrings[j];										if (proposal == null)						proposal= displayString;										if (displayString == null)						displayString= proposal;										addLinkedPositionProposal(groupId, displayString, proposal, null);				}			}						ITrackedNodePosition endPosition= linkedFix.getEndPosition();			if (endPosition != null) {				setEndPosition(endPosition);			}		}				return createChange;	}