Includes progress bar.
Fix dynamic folding in diff view.
(Benjamin Fritz)

window the '?' or '^' on the next line is not redrawn. (Ian Kelling)

(Matt Wozniski)

(Vince Negri)

Cleanup white space.

Problem:    Crash in GUI when closing the last window in a tabpage. (ryo7000)
Solution:   Remove the tabpage from the list before freeing the window.