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b36b3d7f3a
Problem: Tags are manually parsed in C which is not flexible and prone to errors. Extending the help system to allow for other formats (e.g. Markdown) would require a large rewrite in the C core, while with Treesitter it only needs a query update. Solution: Use the power of treesitter to extract the tags from helpfiles. - build: set `$VIMRUNTIME` when generating helptags, like `cmake/Util.cmake` already does for other generators. - fix(help): only accept tags delimited by whitespace. The old C parser only accepted a `*tag*` preceded by start-of-line or whitespace and followed by whitespace or end-of-line. The vimdoc parser also captures tags followed by other text, e.g. `*$XDG_STATE_HOME*/.../logs` in starting.txt, which caused an E154 duplicate tag error for docs that were previously fine.