src/vs/editor/contrib/folding/browser/hiddenRangeModel.ts/HiddenRangeModel/notifyChangeModelContent
class HiddenRangeModel:	public notifyChangeModelContent(e: IModelContentChangedEvent) {
		if (this._hiddenRanges.length && !this._hasLineChanges) {
			this._hasLineChanges = e.changes.some(change => {
				return change.range.endLineNumber !== change.range.startLineNumber || countEOL(change.text)[0] !== 0;
			});
		}
	}