src/vs/editor/browser/widget/inlineDiffMargin.ts/InlineDiffMargin/visibility
class InlineDiffMargin:	set visibility(_visibility: boolean) {
		if (this._visibility !== _visibility) {
			this._visibility = _visibility;

			if (_visibility) {
				this._diffActions.style.visibility = 'visible';
			} else {
				this._diffActions.style.visibility = 'hidden';
			}
		}
	}