Copy-pasting from build log adds empty line between every two lines

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1

To reproduce, simply go to https://travis-ci.org/github/RalfJung/miri-test-libstd/builds/704223291, select some part of the text, Ctrl-C, and then paste it elsewhere:

test iter::test_fuse ... ok

test iter::test_fuse_count ... ok

test iter::test_fuse_fold ... ok

test iter::test_fuse_last ... ok

test iter::test_fuse_nth ... ok

test iter::test_inspect ... ok

test iter::test_inspect_fold ... ok

test iter::test_is_sorted ... ok

test iter::test_iterator_chain ... ok

This is using Firefox 78.0 (but the issue already exists for at least a year).