Renaming a file to an existing directory malfunctions

[edrex]

spc f R to rename file foo, select an existing directory bar/. I was hoping this would move foo to bar/foo and this is indeed what happens on-disk, but the live buffer now has path bar.

Could be tacked onto PR #3825.

[ksjogo]

Could you recreate/reopen with the changes from https://github.com/syl20bnr/spacemacs/pull/3825/files

[github-actions]

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