MUssenger: Chat window opens only after a second click on "Chat"

[sven-n]

When starting a chat with a friend of the friend list in the MUssenger, the first click on "Chat" doesn't open the chat window, but only creates the connection to the chat server. When clicking on "Shat" again, the window opens.

For the player which initiated the chat, the chat window should open, once the connection is done and the client entered the chat room. For the other player, the currently working notification is enough.