[Bug] Environment variables are automatically expanded

[WHYBBE]

Bug Report

The environment variable of "Path" is automatically expanded due to the modification of the environment variable by Scoop.

Current Behavior

1. Add an item to the user's environment variable: Foo=Bar;
2. Add %Foo% to the user's "Path" environment variable;
3. Then Bar can be obtained in the user's "Path" by %Foo%;
4. Try some installation that can change the user's "Path", such as scoop install Python;
5. Then %Foo% will be directly expanded to Bar in "Path".

Expected Behavior

%Foo% should not be expanded after Scoop's modification of "Path"

Additional context

Usually environment variable string expansion will not affect anything, especially %USERPROFILE%\AppData\Local\Microsoft\WindowsApps is often modified by Scoop.

But there are too many items in my "Path" environment variable, and I have a problem with "PATH too long installer unable to modify Path".

So I want to use the %% method to nest another custom environment variable to reduce the length of "Path".

Possible Solution

Try the method without expanding the environment variable.(e.g. PowerShell/PowerShell#17518)

System details

• Windows version: Windows 11 25300
• OS architecture: amd64
• PowerShell version: 7.3.2

Scoop Configuration

{
  "last_update": "2023-02-20T12:28:30.9418781+08:00",
  "aria2-warning-enabled": false,
  "scoop_repo": "https://github.com/ScoopInstaller/Scoop",
  "scoop_branch": "master"
}

[WHYBBE]

Similar to some issues mentioned in #5059.

[WHYBBE]

Solved by #5395.