Bug 128070 [implementation] Check usage of CustomSourceInformationControl
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
/**
	 * Returns the folding action group, or <code>null</code> if there is none.
	 *
	 * @return the folding action group, or <code>null</code> if there is none
	 * @since 3.0
	 */
	protected FoldingActionGroup getFoldingActionGroup() {
		return fFoldingGroup;
	}
	/*
	 * @see org.eclipse.ui.texteditor.AbstractTextEditor#performRevert()
	 */
	protected void performRevert() {
		ProjectionViewer projectionViewer= (ProjectionViewer) getSourceViewer();
		projectionViewer.setRedraw(false);
		try {
			boolean projectionMode= projectionViewer.isProjectionMode();
			if (projectionMode) {
				projectionViewer.disableProjection();
				if (fProjectionModelUpdater != null)
					fProjectionModelUpdater.uninstall();
			}
			super.performRevert();
			if (projectionMode) {
				if (fProjectionModelUpdater != null)
					fProjectionModelUpdater.install(this, projectionViewer);
				projectionViewer.enableProjection();
			}
		} finally {
			projectionViewer.setRedraw(true);