Match URL allowed characters in hints mode

[kevinywlui]

Is your feature request related to a problem? Please describe.

I often run into <foo http://example.com> in my terminal and would like to open http://example.com in hints mode. This matches http://example.com> which is an invalid URL.

Describe the solution you'd like

The allowed URI characters are described in https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Syntax. This excludes > as an allowed character.

I propose that URL matching should only consider valid URI characters.

Note that the current logic is at https://github.com/kovidgoyal/kitty/blob/master/kittens/hints/marks.go#L248C90-L248C104 which expands to (?:gopher|http|ircs|mailto|news|ssh|ftps|https|ftp|gemini|git|sftp|file|irc|kitty)://[^\x00-\x09\x0b-\x0c\x0e-\x20\x7f-\xa0\xad\x{600}-\x{605}\x{61c}\x{6dd}\x{70f}\x{890}-\x{891}\x{8e2}\x{1680}\x{180e}\x{2000}-\x{200f}\x{2028}-\x{202f}\x{205f}-\x{2064}\x{2066}-\x{206f}\x{3000}\x{d800}-\x{f8ff}\x{feff}\x{fff9}-\x{fffb}\x{110bd}\x{110cd}\x{13430}-\x{1343f}\x{1bca0}-\x{1bca3}\x{1d173}-\x{1d17a}\x{e0001}\x{e0020}-\x{e007f}\x{f0000}-\x{ffffd}\x{100000}-\x{10fffd}]{3,}

Describe alternatives you've considered

There is an existing feature https://sw.kovidgoyal.net/kitty/conf/#opt-kitty.url_excluded_characters which handles URL under the cursor. Ideally, there would be synergy between URLs in hints-mode and URLs-under-cursor, but it appears there currently isn't.

Additionally, I think URL matching only valid URL characters is a reasonable default behavior.