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From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: zsh-users@zsh.org
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Date: Fri, 23 Nov 2018 11:11:39 +0000
Subject: Completion of empty directories

$ zsh -f
% mkdir xxx
% mv * x/<TAB>

When xxx/ is empty, the <TAB> does nothing.  Could it complete x/ to xxx/?

Using _complete_debug (on another example, xxx/f/ -> xxx/foo/ with
xxx/foo/ being empty) I see that xxx/foo/ _is_ getting matched against,
but I haven't been able to identify the point (in _path_files,
presumably) where it is checked that the directory is non-empty.