Bug - Web Ide - When a branch has the # Character in it the Web IDE doesn't handle the branch name correctly

Summary

Steps to reproduce

Create a new branch with the name that includes a # for example "issue-reproduction#-branch-name" Find or create a file that can be edited with the web ide

Example Project

https://gitlab.com/edstub207/NMI/blob/issue-reproduction%23-branch-name/blah.md

What is the current bug behaviour?

When editing the file the web ide goes to a branch that doesn't exist

What is the expected correct behaviour?

When editing the file the web ide goes to the branch correctly.

Relevant logs and/or screenshots

Output of checks

The issue can be reproduced on Gitlab.com