bug: URLs get encoded wrongly:

```shell
https://gitlab.com/bla/bla/-/merge_requests/new?merge_request%5Bsource_branch%5D=feat%2Fremove-subdir-pdp
```

will make an URL where the `=` is encoded as `%3D` which is not good. Why does that happen?

```shell
https://gitlab.com/bla/bla/-/merge_requests/new%3Fmerge_request%5Bsource_branch%5D%3Dfeat/remove-subdir-pdp
```
If it wouldnt happen I could open the URL =)