Summary:
*Potentially.
A big thanks to lblasa and aigoncharov for helping with debugging. Looking at
`ptail -f errorlog_flipper_javascript` reveals that messages now include a spurious amount of unescaped newlines. E.g. P768993195
From memory, these were not there when I wrote the categorizer when I was able to copy-paste from ptail to the unit tests.
D44729490 added prettifying to the results inadvertently.
Reviewed By: lblasa
Differential Revision: D46685543
fbshipit-source-id: 98da5eff92900042fc5306ca5d5652d8940ff2e1
bf2f1283d3