[widget-standalone] impossible to change a network

[elena-zh]

1. Open the widget configurator
2. Connect to MM in in the standalone mode
3. Using configuration panel, change a network in the widget

AR:

1. the network is not changed: balances are still shown from a previous network.
2. However, the configurator itself shows the newly selected network.
3. The new network is not picked when disconnect-reconnect a wallet again
   
   

ER: the network should be changed.

[shoom3301]

I've investigated the case and found out that it's a Metamask's bug...

Key point - Metamask browser extension does not send events (e.g. chanChanged) to iframes.

How to check that:

1. Try using Metamask mobile via WalletConnect change network in the wallet and it should be updated in the widget)
2. Cheat the Metamask browser extension:

• Open https://widget.cow.fi/
• Switch to Standalone mode
• Change network in Metamask to Mainnet
• Connect Metamask
• Open https://swap.cow.fi/ in another tab and connect Metamask there as well
• Change network in Metamask to Gnosis chain
• AR: network in Widget tab and CowSwap tab is Gnosis chain!

It happens because in the 5th step we make Metamask think that current active tab is swap.cow.fi and it starts sending events to the widget iframe (which is actually swap.cow.fi).
Unfortunately I don't see any ways how we can improve this on our side 😞
The only way is to report the problem to Metamask and wait.