Prevent exponential explosion of text-mode rendering of deeply nested blockquotes
Summary:
Currently, the text-mode rendering of blockquotes doubles the number of lines in the input text. For example, a deeply nested input text like this:
>>>> a >>>> b
...gets expanded to:
> a > b
...then to:
> > a > > > b >
...and so on. If you nest something 28 levels deep, we generate 60 million lines from it.
So:
- Stop doing that.
- Make it look nicer.
- Also make it put ">>>" at the beginning instead of "> > >".
Special thanks to @csilvers for hunting this down.
Test Plan:
Added a unit test.
Generated mail for >>>>>>>>>>>>>>>>>>>>>>>>>>> REQUESTING CHANGES BECAUSE I'M ANGRY!.
Reviewers: chad
Reviewed By: chad
Subscribers: spicyj, csilvers
Differential Revision: https://secure.phabricator.com/D14247