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Empty ""s in ARG in ${x:+ARG} expand to no words instead of the empty word if prepended/appended with space

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  Empty ""s in ARG in ${x:+ARG} expand to no words instead of the empty word if prepended/appended with space Denys Vlasenko <dvlasenk@redhat.com> - 2018-07-20 16:43 +0200

#14372 — Empty ""s in ARG in ${x:+ARG} expand to no words instead of the empty word if prepended/appended with space

$ f() { for i; do echo "|$i|"; done; }
$ x=x
$ e=

$  f ${x:+""}
||
^^^^^^^^^^^ correct

$ f ${x:+ ""}
^^^^^^^^^^^ prints nothing, bug?

$  ${x:+"" }
^^^^^^^^^^^ prints nothing, bug?

$ f ${x:+"$e"}
||
^^^^^^^^^^^ correct

$ f ${x:+ "$e"}
^^^^^^^^^^^ prints nothing, bug?

$ f ${x:+"$e""$e"""}
||
^^^^^^^^^^^ correct

$ f ${x:+"$e""$e"""}
^^^^^^^^^^^ prints nothing, bug?


Similarly with: f ${x:+"`echo`" } etc...

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