GNU bug report logs - #34397
completion forgets to escape "?"

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
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Subject: completion forgets to escape "?"
Date: Sat, 09 Feb 2019 13:34:23 +0800
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$ ls
https:__example.com_messages_?folder=other.html
https:__example.com_messages_?folder=pending.html
https:__example.com_messages_?folder=unread.html
M-x compile ls h<TAB>
upon which you will see that M-x compile completion forgets to escape "?"
so one cannot successfully finish completing any of the names.

One gets as far as
Compile command: ls https:__example.com_messages_?folder= [No match]

See how it can't match the stem that it already filled in mostly of for us.