1964253 - % gets double-URL encoded in URLs when partially selected from start

Status: NEW

(Firefox :: Address Bar, defect, P3)

Description

[pokechu022]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Steps to reproduce:

1. Navigate to https://davwebsites.dav.org/SitePages/LocateDepartmentChapter.aspx?RootFolder=%2FLists%2FDeptsandChaptersLinks%2FAlabama
2. Select the URL
3. Adjust the selection to only https://davwebsites.dav.org/SitePages/LocateDepartmentChapter.aspx?RootFolder=%2FLists%252FDeptsandChaptersLinks%2F
4. Copy the URL

Actual results:

The URL that is copied is https://davwebsites.dav.org/SitePages/LocateDepartmentChapter.aspx?RootFolder=%252FLists%252FDeptsandChaptersLinks%252F

Expected results:

Instead of %252F, the URL should be %2F.

This is probably most likely to happen with % in URLs (e.g. https://en.wikipedia.org/w/index.php?title=%25&redirect=no) but any one which has URL encoding is affected (however, if it uses / instead of %2F, this does not happen; https://davwebsites.dav.org/SitePages/LocateDepartmentChapter.aspx uses %2F instead of / though).

This is a regression from 2021-11-26 - almost certainly bug 1539511. That version also made it so that that copying the URL on e.g. https://ru.wikipedia.org/wiki/%D0%97%D0%B0%D0%B3%D0%BB%D0%B0%D0%B2%D0%BD%D0%B0%D1%8F_%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0 will still URL encode if part of the URL is selected from the start (e.g. https to Заглавная), but if the start isn't selected then it doesn't encode (e.g. if just Заглавная_страница is selected). This initially surprised me but seems to be intended behavior based on bug 1539511.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Networking' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Monica Chiorean]

I was able to reproduce the issue on Win11x64 using Firefox build 139.0b4. If I copy link that ends in '%2F' it loads as '%252F' in different tab. Though the sites do not load.
Marking issue as new.