Micro opens DOS format files as UNIX format

Description of the problem or steps to reproduce

• The option "fileformat": "dos" is correctly set in <settings.json>.
• When creating new files, Micro correctly creates and saves as DOS, and opens the same file as DOS.
• But then, I open any file with the DOS format (CRLF) and it's actually opened as UNIX, and saved as UNIX.
• Micro doesn't seem to correctly recognize CRLF.

However, after the previous test I added a fifth empty line and Micro now sees the file correctly as DOS:

So.. Micro seems to only recognize and save to the DOS format if there's a CRLF at the end, an empty line. But this is a problem.. I've tried about a dozen of scripts and it almost always wrongfully sets the UNIX format. In fact, I noticed this after Micro had changed a bunch of files I had been working on, changing them to the UNIX format.

Specifications

Commit hash: b9763856
OS: Windows 10
Terminal: ConEmu/CMD/PowerShell

Reproduce the problem with a short CRLF file on the stated Windows terminal environments, comparing files with and without a final empty line. Then trace Micro's file-format detection and saving behavior; done means existing CRLF files are recognized and saved as DOS without requiring a trailing empty line.