Warn a user that clicking on another server will delete any pending edits they've made to a message

If you're typing a message in Server A and then click on Server B, when you go back to Server A the unsent message will still be there where you left it. However, if you're instead editing a message of yours, going to Server B deletes all of your pending changes, and you'll simply find an empty message box upon returning to Server A. I've accidentally lost 10+ minutes of edits on more than one occasion now.

One of two fixes should be implemented:

1 - Have the edit message panel save and reappear when you return to that server, like how writing regular messages works.

2 - Warn the user when they click another server "Leaving this server will discard your unsaved message changes. Proceed?"