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Problem: tests: "Xm4" test directory may not be deleted
Solution: Use "R" flag with mkdir() call to have the directory
recursively deleted at the end of function Test_m4_format()
(Muraoka Taro)
Test_m4_format in test_filetype.vim creates the "Xm4" directory with the
'D' flag. Then it creates two files in the "Xm4" directory. One of them,
"alocal.m4," was created with the 'D' flag, so it will disappear after
the test is complete. However, the other, "configure.ac," was created
without any flags, so it will remain even after the test is complete.
Because the parent directory "Xm4" was created with the 'D' flag, the
latter "configure.ac" remains and is not empty, so it will not be
deleted.
This forces the directory to be deleted regardless of its contents. As a
result, the two files "alocal.m4" and "configure.ac" created in the
directory are no longer needed, so they have been deleted.
closes: vim/vim#18995
de37e7430a
Co-authored-by: Muraoka Taro <koron.kaoriya@gmail.com>