src/vs/base/browser/ui/scrollbar/scrollbarVisibilityController.ts/ScrollbarVisibilityController/setShouldBeVisible
class ScrollbarVisibilityController:	public setShouldBeVisible(rawShouldBeVisible: boolean): void {
		const shouldBeVisible = this.applyVisibilitySetting(rawShouldBeVisible);

		if (this._shouldBeVisible !== shouldBeVisible) {
			this._shouldBeVisible = shouldBeVisible;
			this.ensureVisibility();
		}
	}