pile: work around perf regression when moving to urwid from core24 #2161
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urwid added support in Pile() objects for widgets with fixed sizing. However, this caused big performance issues for us. Going up and down in the the guided storage screen is > 30 times slower now.
Maybe there is something smart to do ; but in the meantime, let's "revert" the upstream urwid change in our own Pile() implementation.
LP:#2089681
urwid/urwid#733