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Also fix some anomalies in the handling of byte positions in regexp-emacs.c
This fixes bug #34525.

* src/intervals.c (SET_PARENT_POSITION): New macro.
(update_interval): When moving to an interval's parent, set that parent's
->position field, to maintain the consistency of the tree.

* src/intervals.h (struct interval): Amend the comment describing when
->position is valid.

* src/pdumper.c: Update the hash associated with struct interval.

* src/regex-emacs.c: (re_match_2_internal): Only invoke POINTER_TO_OFFSET on a
known character boundary.  Only perform arithmetic on character positions, not
on byte positions.  Correct the argument to an invocation of
UPDATE_SYNTAX_TABLE_FORWARD by adding 1 to it (in case wordend:).

* src/syntax.c: (update_syntax_table): Remove the now redundant code that set
the ->position field of all parents of the interval found by update_interval.