Peculiar Dos-Unix Unicode bug

Background

Windows 7 (chcp 65001), micro 2.0.8 (cfcb2e45).

Aggrrhh

1. Run micro create.cmd, Add a few lines mkdir "Hello dear" & mkdir "Привет дорогой", then Save and Quit.

   

2. Run create.cmd. We see that 2 dirs are successfully created. Delete them for now.

3. Run micro create.cmd again. This time it’s not dos, suddenly it’s unix. Add a new line mkdir 123, Save, Quit.

   

4. This time create.cmd won’t be able to create one dir (with a Russian name) as follows

   '�вет' is not recognized as an internal or external command, operable program or batch file.
   

Workaround

If we run micro create.cmd once again, then CTRL+E, then set fileformat dos, then Save, it will work.

Conclusion

Something is not right here, because create.cmd with the same contents created by other editors works as expected.

Reproduce the sequence on Windows 7 with chcp 65001 using micro create.cmd, including the repeated edit and fileformat changes. Start by tracing fileformat detection and save behavior for DOS and Unix files; done means reopening and saving the batch file preserves its DOS format so the Cyrillic directory command still works.