src/vs/editor/browser/coreCommands.ts/EditorScrollImpl/_runHorizontalEditorScroll
class EditorScrollImpl:		_runHorizontalEditorScroll(viewModel: IViewModel, source: string | null | undefined, args: EditorScroll_.ParsedArguments): void {
			const desiredScrollLeft = this._computeDesiredScrollLeft(viewModel, args);
			viewModel.viewLayout.setScrollPosition({ scrollLeft: desiredScrollLeft }, ScrollType.Smooth);
		}