src/vs/editor/browser/viewParts/currentLineHighlight/currentLineHighlight.ts/AbstractLineHighlightOverlay/_shouldRenderInMargin
class AbstractLineHighlightOverlay:	protected _shouldRenderInMargin(): boolean {
		return (
			(this._renderLineHighlight === 'gutter' || this._renderLineHighlight === 'all')
			&& (!this._renderLineHighlightOnlyWhenFocus || this._focused)
		);
	}