When narrowing changes, parse reparses, so the timestamp should
definitely increment, just like in ts_record_changes.
Failing to increment this timestamp, outdated nodes would think they
are still up-to-date, and try to print their type name. Printing
their type name involves accessing the old parse tree, which is
already freed during the last reparse.
I also found that we don't increment timestamp when changing parser
ranges and fixed that as well.
* src/treesit.c (treesit_sync_visible_region):
(Ftreesit_parser_set_included_ranges): Increment timestamp.
* src/treesit.h (Lisp_TS_Parser): Add some comments.
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