Floating Welcome Text does not disappear after second login

[voidowl-rl]

Description:
The floating welcome text will not disappear after any logins after the first one on the local server.

Reproduction:
On login on the local server (without character-list-based login):

1. Login once
2. Logout
3. Login again

Analysis:
Character-List-Based login uses one additional screen (charScreen). No additional state change does happen. The code leading to the display of the floating text is the same not matter which number of login attempt. Everything is set correctly. Internal hide() function of Nifty just does nothing on the second login attempt. Presumption: Some nifty internal state chaos which is maybe resetted by the nifty-screen-change that does happen for character-list-based login.

Splitted from #114

[estralis]

Under the same circumstances, other UI issues happen. Two problems I encountered:

• Dialog boxes cannot be interacted with
• Inventory/bag cannot be interacted with

Any clicks on these elements are registered as if the map below the elements was clicked (=I walk around aimlessly).