Problem: shellescape() called without {special} flag for :! ex command
Solution: Pass 1 as second argument to shellescape() in :! contexts
related: Commit: 3fb5e58fbc63d86a3e65f1a141b0d67af2 (patch 9.2.0479:
[security]: runtime(tar): command injection in tar plugin)
129486193c
Co-authored-by: Christian Brabandt <cb@256bit.org>