[PATCH] Use completing-read-multiple for org-set-tags-command

[Clemens]

Hello,

Usage of org-set-tags-command can be improved by using 
completing-read-multiple so you continue to get completion after the 
first tag.

This is my first contribution to org I followed 
https://orgmode.org/worg/org-contribute.html and hope I got everything 
right.

I have signed the FSF documents (I have packages on ELPA).


    Clemens

0001-org.el-Use-completing-read-multiple-for-org-set-tags.patch
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