Steps to reproduce:

1. Start tmux in gnome-terminal.
2. Start whdd in tmux.
   
3. Make new pane in tmux (at the same tmux window, where whdd start) [Ctrl-b "].
   
4. Make whdd pane full size [Ctrl-b z].
5. Start "Read test" in whdd.
   
6. Restore whdd pane to original size [Ctrl-b z].
   

Current result: GUI have invalid data.
Expected result: GUI must be fully refreshed.