`find_target()` failed to match numbers followed by a dot and a
non-digit (e.g. `1. item`), because the dot unconditionally reset
the scan state, discarding the number. Additionally, numbers at the
start of non-first lines were missed because the backward scan
stopped on the preceding newline and the forward scan immediately
broke on it.
Closes#47761
Release Notes:
- Fixed vim increment (`ctrl-a`) and decrement (`ctrl-x`) not working on Markdown ordered list markers like `1.`, `2.`, etc.
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: dino <dinojoaocosta@gmail.com>
