Wieh urwid > 2.1.2, the screen is only redrawn after urwid handles an
event (e.g., keypress, resize, ...) or an urwid alarm (it is like a
timer).
All other changes made to the UI do not trigger a screen redraw. We now
redraw the screen properly after moving from one screen to another.
Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>
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