`doctest(...; fix=true)` not working

[eahenle]

The fix=true functionality has stopped working as it used to. When attempting to update doctest outputs in this way, the result is now a warning (Warning: could not find code block in source file DocTests.jl:421) and the doc source files are unchanged.

Interestingly, some changes do work. Specifically, if the only changes are line ending characters, there is no problem, but if a snippet of output in the middle of a larger output block must change, the fix fails.

[AshlinHarris]

What OS were you using? I have the same issue on Windows, but not on Linux.

[odow]

Closing as a duplicate of https://github.com/JuliaDocs/Documenter.jl/issues/1901