src/vs/workbench/contrib/scm/browser/dirtydiffDecorator.ts/DirtyDiffWorkbenchController/onDidChangeDiffVisibiltiyConfiguration
class DirtyDiffWorkbenchController:	private onDidChangeDiffVisibiltiyConfiguration(): void {
		const visibility = this.configurationService.getValue<'always' | 'hover'>('scm.diffDecorationsGutterVisibility');
		this.setViewState({ ...this.viewState, visibility });
	}