src/vs/workbench/api/common/extHostEditorTabs.ts/ExtHostEditorTabs/$acceptTabGroupUpdate
class ExtHostEditorTabs:	$acceptTabGroupUpdate(groupDto: IEditorTabGroupDto) {
		const group = this._extHostTabGroups.find(group => group.groupId === groupDto.groupId);
		if (!group) {
			throw new Error('Update Group IPC call received before group creation.');
		}
		group.acceptGroupDtoUpdate(groupDto);
		if (groupDto.isActive) {
			this._activeGroupId = groupDto.groupId;
		}
		this._onDidChangeTabGroups.fire([group.apiObject]);
	}