[Bug 2998] New: utf8clean should mask surrogate code points…

https://bugs.exim.org/show_bug.cgi?id=2998

            Bug ID: 2998
           Summary: utf8clean  should mask surrogate code points (U00D800
                    to U00DFFFF)
           Product: Exim
           Version: N/A
          Hardware: All
                OS: All
            Status: NEW
          Severity: bug
          Priority: medium
         Component: String expansion
          Assignee: unallocated@???
          Reporter: jasen@???
                CC: exim-dev@???

Created attachment 1444
--> https://bugs.exim.org/attachment.cgi?id=1444&action=edit
patch to fix.

Unicode code points \U00D800 to \U00DFFF only have meaning in UTF-16 (where
they are used in surrogate pairs) they should not appear in UTF-8 (see
https://www.ietf.org/rfc/rfc2279.txt section 2)

To this end ${utf8clean: should mask them.

patch attached.

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