Because URI paths may contain non US-ASCII characters we need to force
the encoding of any unescaped URIs to UTF-8 if they are US-ASCII.
This essentially replicates the functionality of the monkey patch to
URI.parser.unescape in active_support/core_ext/uri.rb.
Fixes#16104.
1. Escape '%' characters in URLs - only unescaped data
should be passed to URL helpers
2. Add an `escape_segment` helper to `Router::Utils`
that escapes '/' characters
3. Use `escape_segment` rather than `escape_fragment`
in optimized URL generation
4. Use `escape_segment` rather than `escape_path`
in URL generation
For point 4 there are two exceptions. Firstly, when a route uses wildcard
segments (e.g. *foo) then we use `escape_path` as the value may contain '/'
characters. This means that wildcard routes can't be optimized. Secondly,
if a `:controller` segment is used in the path then this uses `escape_path`
as the controller may be namespaced.
Fixes#14629, #14636 and #14070.
Makes it clear that anything passed with the helper must not be percent encoded.
Fixes previous behavior which tricks people into believing passing
non-percent-encoded will generate a proper percent-encoded path while in
reality it doesn't ('%' isn't escaped).
The intention is nice but the heuristic is broken.
Move the Journey code underneath the ActionDispatch namespace so
that we don't pollute the global namespace with names that may
be used for models.
Fixesrails/journey#49.
