src/vs/editor/contrib/folding/browser/folding.ts/FoldAllRegionsExceptAction/invoke
class FoldAllRegionsExceptAction:	invoke(_foldingController: FoldingController, foldingModel: FoldingModel, editor: ICodeEditor): void {
		let selectedLines = this.getSelectedLines(editor);
		setCollapseStateForRest(foldingModel, true, selectedLines);
	}