: , and / stay inside a clickable URL

Tabby's URL handler dropped a colon, comma or slash from a path or query, so a link to a line number or a list parameter stopped short of where it pointed. Three characters added to two character classes.

Tabby's URL handler excluded :, , and / from the character classes it used for a URL's path and query, so a link stopped short of where it pointed — a line-number anchor, a list parameter, a nested path.

Three characters, added to two character classes.

• The source catalogue records no separate caveats for this entry. The implementation and evidence above define its scope.

Sent upstream as upstream pull request #11383 (local implementation) and not merged. It is carried here rather than waited for, which is what this fork is for.