Resource pack URL encoding changes "%20" to "+"

[tomlyo]

Bug Report

System Information

• Windows 10 Pro version 21H2
• AMP Release "Triton" v2.3.2.8, built 28/03/2022 15:21
• Mainline Build

I confirm:

• [x] that I have searched for an existing bug report for this issue.
• [x] that I am using the latest available version of AMP.
• [x] that my operating system is up-to-date.

Symptoms

• What are you trying to do? Include a resource pack URL for my minecraft server. The URL is pointed to a pack that is updated by ModelEngine, and it defaults to "resource pack.zip" This url has to be encoded due to the space.

When adding a url that ends in /resource%20pack.zip and refresh the page, the URL encoding is lost as it automatically changes the encoding from "%20" to "+". Preventing the pack from being downloaded.

• What are you expecting to happen? Allow url encoding in the resource pack URL field for spaces

• What is actually happening? ('Nothing' is not an acceptable answer!) The URL encoding is changing from "%20", to "+", preventing the resource pack from downloading.

Reproduction

• Add a resource pack URL with a space in it
• Refresh AMP's page.
• Observe the resource pack URL has changed the url encoding for a space to "+" which makes the pack not downloadable.