Bug 28716 [misc] 'Goto Matching Bracket' fails when 'Show Source of Selected Element Only' is selected
When the 'Show Source of Selected Element Only' button is pressed and the editor is narrowed down to the selected method the Goto Matching Bracket action fails. It reports 'No Matching Bracket' found in the status bar. Invoking the same action on the same bracket when the editor shows the whole of the source file works as expected.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
return (key != null && preferences.getBoolean(key));
	}
	/**
	 * Computes and returns the source reference that includes the caret and
	 * serves as provider for the outline page selection and the editor range
	 * indication.
	 * 
	 * @return the computed source reference
	 * @since 3.0
	 */
	protected ISourceReference computeHighlightRangeSourceReference() {
		ISourceViewer sourceViewer= getSourceViewer();
		if (sourceViewer == null)
			return null;
			
		StyledText styledText= sourceViewer.getTextWidget();
		if (styledText == null)
			return null;
		
		int caret= 0;
		if (sourceViewer instanceof ITextViewerExtension3) {
			ITextViewerExtension3 extension= (ITextViewerExtension3)sourceViewer;
			caret= extension.widgetOffset2ModelOffset(styledText.getCaretOffset());
		} else {
			int offset= sourceViewer.getVisibleRegion().getOffset();
			caret= offset + styledText.getCaretOffset();
		}
		IJavaElement element= getElementAt(caret, false);
		
		if ( !(element instanceof ISourceReference))