[vim/vim] gx (URLOpen) fails for percent-encoded urls (Issue #20149)

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grr

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May 6, 2026, 5:48:22 AM (yesterday) May 6

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grr created an issue (vim/vim#20149)

Steps to reproduce

call user command :URLOpen https://example.com/path/magnet%3A%3Fxt%3Durn%3Abtih%3Ainfohash and it will silently fail
whereas the url that is not encoded works: URLOpen https://example.com/path/magnet:

Expected behaviour

The encoded example should open. Calling open $encoded_url (which :URLOpen basically does) works on macos from the command-line. This might be related to #16252. Is it because the URL matching is failing here?

Version of Vim

9.2, including patches 1-321

Environment

Operating system: macOS
Terminal: iterm2
Value of $TERM: xterm-256color
Shell: bash

included in .vimrc:
let g:netrw_gx = ''

Logs and stack traces

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Enno

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May 6, 2026, 10:09:53 AM (yesterday) May 6

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Konfekt left a comment (vim/vim#20149)

Very likely the special shellescape() argument missing somewhere

> doc/builtin.txt (lines 10496-10501)
		The {special} argument adds additional escaping of keywords
		used in Vim commands.  When it is not omitted and a non-zero
		number or a non-empty String (|non-zero-arg|), then special
		items such as "!", "%", "#" and "<cword>" (as listed in
		|expand()|) will be preceded by a backslash.
		This backslash will be removed again by the |:!| command.

Could you bisect to the exact change to openPlugin.vim that broke it, such as a2dd40c?

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