This has bothered me for ages so I've overridden it with user CSS. It wasn't easy to figure out the right incantation, it's this: 

tr.reply-body ul.indent font[size="2"] { font-size: 100% }

[download]

I'm mentioning this in case anyone wants to write a rule to emulate the old behaviour.

In reply to Re: Size of text in replies when showing threads by ambrus
in thread Size of text in replies when showing threads by jdporter

Title:
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