src/vs/base/browser/ui/scrollbar/scrollbarVisibilityController.ts/ScrollbarVisibilityController/_updateShouldBeVisible
class ScrollbarVisibilityController:	private _updateShouldBeVisible(): void {
		const shouldBeVisible = this._applyVisibilitySetting();

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