Clarify the reason why there is the restriction on changing the set of stores

[vkrol]

#745 (comment)

[danielkcz]

Thanks

[nebosite]

@FredyC , since the thread here is locked, I'll post my comment here:

I ran into the "provided stores has changed" exception today trying to do what felt pretty innocent based on my data-binding experience with XAML apps. Basically, I'm showing a set of controls based on an array of models. The onClick of the refresh button tries to swap out one of the models in the client array for a new model. This is where the exception happens.

Here is the UI code:

    render() {
        const {gameTestModel} = this.props;
        if(gameTestModel.presenterSize === 0) this.updatePresenterSize(window.innerWidth);
        
        const renderClient = (clientNumber: number) => {
            const clientModel = gameTestModel.clientModels[clientNumber];

            return (
                <React.Fragment>
                    <button onClick={()=>gameTestModel.refreshClientModel(clientNumber)}>Refresh</button>
                    <LobbyMainPage lobbyModel={clientModel} /> 
                </React.Fragment>)
        }

        return (
            <div className="gameTestComponent">
                <table>
                    <tbody>
                        <tr>
                            { [0,1,2,3].map(n => <td key={n}>{renderClient(n)}</td> )}
                        </tr>
                    </tbody>
                </table>
            </div>
        );
    }

Here is the relevant model code:

export class GameTestModel  {
    clientModels = observable(new Array<ILobbyModel>())

    constructor(numberOfClients: number)
    {
        for(let i = 0; i < numberOfClients; i++)  {
            this.clientModels.push(this.makeClientModel(`client${i}`))
        }
    }

    private makeClientModel(clientName: string)
    {
        const newLobby = new LobbyModel();
        newLobby.playerName = clientName;
        return newLobby;
    }
}

[danielkcz]

Sorry, but PR is not a place for discussing your problem. Open a new issue with reproduction, thanks.