src/vs/workbench/services/history/browser/historyService.ts/EditorNavigationStack/doAdd
class EditorNavigationStack:	private doAdd(groupId: GroupIdentifier, editor: EditorInput | IResourceEditorInput, selection?: IEditorPaneSelection): void {
		if (!this.navigating) {
			this.addOrReplace(groupId, editor, selection);
		}
	}