check as below screen pls, line 21 occupied two lines height. I checked the original text, they should be same, you can check on second screenshot in notepad++, nothing special for those lines.
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Check out https://secure.phabricator.com/book/phabcontrib/article/bug_reports/ on what we look for in bug reports. Specifically, we need to be able to build a repro case. Feel free to repro by uploading a diff to this server if you need.
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@taoqiping if you can reproduce the issue on this install, we can take a look, otherwise I'll close this out.