src/vs/workbench/contrib/scm/browser/dirtydiffDecorator.ts/DirtyDiffWorkbenchController/setViewState
class DirtyDiffWorkbenchController:	private setViewState(state: IViewState): void {
		this.viewState = state;
		this.stylesheet.textContent = `
			.monaco-editor .dirty-diff-modified,.monaco-editor .dirty-diff-added{border-left-width:${state.width}px;}
			.monaco-editor .dirty-diff-modified, .monaco-editor .dirty-diff-added, .monaco-editor .dirty-diff-deleted {
				opacity: ${state.visibility === 'always' ? 1 : 0};
			}
		`;
	}