Don't print out excessive ANSI codes #27
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The ANSI renderer was printing out astonishing quantities of SGR 0s,
which don't hurt anything but has bad code aesthetics. Fix it to only
print out font requests when the font changes.
before:
```
♪ pandoc$ cabal exec -- pandoc -t ansi doc/customizing-pandoc.md | wc -c
17986
```
after:
```
♪ pandoc$ cabal exec -- pandoc -t ansi doc/customizing-pandoc.md | wc -c
5297
```
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The ANSI renderer was printing out astonishing quantities of SGR 0s, which don't hurt anything but has bad code aesthetics. Fix it to only print out font requests when the font changes.
before:
after: