vim-patch:e9c5e56: runtime(python): improve performance of number and ellipsis matching (#41608)

Problem:  The floating-point `.d` number match and the two ellipsis
          matches are slow: each begins with a look-behind, which cannot
          be reduced to a fixed first character, so the automatic regexp
          engine selects the slower NFA backend for them.
Solution: Force the backtracking engine with \%#=1 on those three
          patterns; it evaluates the look-behind far more efficiently.
          Highlighting is unchanged.

Measured with :syntime over a 40000 line corpus: the three affected
rules drop from ~0.13s to ~0.008s (about -93%), which cuts the total
syntax parse cost by ~10% (1.85s to 1.65s).

closes: vim/vim#21194

https://github.com/vim/vim/commit/e9c5e56081d1923caab5efce1f6fca4e235cf350

Co-authored-by: Julien Voisin <julien.voisin@dustri.org>

0 files changed, 0 insertions, 0 deletions