Commits on Jan 1, 2020

1. Reset Formatter flags on exit from pad_integral …

   This fixes a bug where after calling pad_integral with appropriate flags, the
   fill and alignment flags would be set to '0' and 'Right' and left as such even
   after exiting pad_integral, which meant that future calls on the same Formatter
   would get incorrect flags reported.
   
   This is quite difficult to observe in practice, as almost all formatting
   implementations in practice don't call `Display::fmt` directly, but rather use
   `write!` or a similar macro, which means that they cannot observe the effects of
   the wrong flags (as `write!` creates a fresh Formatter instance). However, we
   include a test case.

   

   Mark-Simulacrum committed Jan 1, 2020
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