Forcing redraw of a LC window

[-hh]

I remember some discussions here about screen refresh and how
to force the redraw of a (possibly resized) LC window.

I recently found a method that works all the time for me, even
for cards that are 'overloaded' in some sense. I couldn't find
it mentioned until now, so I should share it.

I use it mostly just before an "unlock  screen":
** set backcolor of this card to the backcolor of this card **



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