bug#46501: Shell-script mode vs here-docs

["積丹尼 Dan Jacobson" <jidanni@jidanni.org>]

$ cat s.sh
#!/bin/bash
xxx=yyy
#Here Shell-script mode should make the $(beep) into the same color as the rest of the line:
cat <<\EOF
Bla Bla $xxx $(beep)
EOF
#And here Shell-script mode should make $xxx a different color than the rest of the line:
cat <<EOF
Bla Bla $xxx $(beep)
EOF
#By the way, in this comment, $(beep) should be the same color as the rest of the comment.
$ emacs -Q s.sh
(By the way, changing /bin/bash to /bin/sh above fixes most of the
problems.)
emacs-version "27.1"