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[3.13] gh-143930: Reject leading dashes in webbrowser URLs (GH-146215)

(cherry picked from commit 82a24a4442312bdcfc4c799885e8b3e00990f02b)

Co-authored-by: Seth Michael Larson <seth@python.org>
M
Miss Islington (bot) committed
43fe06b96f6a6cf5cfd5bdab20b8649374956866
Parent: daa4106
Committed by GitHub <noreply@github.com> on 3/23/2026, 11:17:50 PM