[O] Bug: emphasis crosses quotation marks [9.0.9 (release_9.0.9 @ /usr/new/share/emacs/26.0.50/lisp/org/)]

[Mike Kupfer]

In Emacs master ("GNU Emacs 26.0.50 (build 3, x86_64-pc-linux-gnu, X
toolkit, Xaw scroll bars) of 2017-07-30", git changeset c8f44e4b; Org
mode 9.0.9), I get strikeout text from "+" to "+" in

    "+" word "+"

(I also see the strikeout with "emacs -Q".)

In Emacs 25.2 (Org mode 8.2.10), that line does not get strikeout text.

I would not expect emphasis to cross quotation marks.  And it makes
sections of my MH-E Todo file pretty much unreadable, because of text
like

  So should mh-normalize-folder-name treat "+/" the same as "+", or
  should its callers special-case "+" (after normalization)?

Please restore the (single and double) quotation marks that used to be
in the "border" section of org-emphasis-regexp-components.  And perhaps
the comma should be restored, too?

thanks,
mike