- Mostly GUI fixes, making it more responsive even when a message is
displayed. (They rely on the GUI QEventLoop through show() instead of
the exec() function, which occupies the whole thread.)
 - New bug where hiding the progress window without calling any message
window before the main process begins causes it to freeze and not hide.
(It's not the pretty type of freeze, it doesn't redraw anything.)
Doesn't happen when it is not to be hidden by the jason.hide-ui-on-run
option.