src/vs/workbench/services/history/browser/history.ts/HistoryService/addToNavigationStack
class HistoryService:	private addToNavigationStack(input: IEditorInput | IResourceEditorInput, selection?: Selection): void {
		if (!this.navigatingInStack) {
			this.doAddOrReplaceInNavigationStack(input, selection);
		}
	}