[FEATURE] Automatically save drafted message on a per conversation basis

[danry25]

The send field should save a draft of its current content if more than 5 characters have been written and you switch between conversations, that way when you return to the conversation you can pick up mid-thought where you left off.

[uncheckederror]

Couldn't we preserve the state of the message box on a per conversation basis so that it doesn't get replace when you switch conversations?