docs: require enabled long-paths when contributing

docs/contributing/BuildFromSource.md

@@ -23,6 +23,7 @@ Building Razor on Windows requires:
 - Windows 10, version 1803 or newer
 - At least 10 GB of disk space and a good internet connection (our build scripts download a lot of tools and dependencies)
 - Git. <https://git-scm.org>
+- [LongPaths](LongPaths.md) to be enabled
 
 ### macOS/Linux
 
@@ -81,17 +82,6 @@ Executing `.\restore.cmd` or `.\build.cmd` may produce these errors:
 
 In most cases, this is because the option _Use previews of the .NET Core SDK_ in VS2019 is not checked. Start Visual Studio, go to _Tools > Options_ and check _Use previews of the .NET Core SDK_ under _Environment > Preview Features_.
 
-### Common error: path too long (on windows)
-If you encounter errors pointing to `path-too-long` errors, like:
-```
-Path: {{SOME-PATH}} exceeds the OS max path limit. The fully qualified file name must be less than 260 characters.
-```
-or
-```
-error LongPathsDisabled: Long paths are required for this project. See 'docs/contributing/LongPaths.md'.
-```
-see [LongPaths](LongPaths.md) on how to deal with this.
-
 ## Building with Visual Studio Code
 
 Outside of Razor's language server and C# workspace logic, the bulk of our VS Code logic now lives in the [dotnet/vscode-csharp](https://github.com/dotnet/vscode-csharp) repo.

docs/contributing/LongPaths.md

@@ -34,19 +34,6 @@ Either import / execute [/eng/enable-long-path.reg] or invoke the following powe
 New-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\FileSystem" -Name "LongPathsEnabled" -Value "1" -PropertyType DWORD -Force
 ```
 
-### Use [subst] to shorten your local path
-> :warning: While this might work in your particular environment, chances are high that future changes might introduce even longer paths, which might then again result in above errors.
-> Also, [subst] has no way to make a substitution permanent, so you might need to repeat this step after reboots, or ensure it get's executed at startup.
->
-If you don't want to / can't enable long path support globally, try shortening your local path with [subst] where `R` is a free drive-letter, e.g.:
-
-> ```ps1
-> $dir = pwd
-> subst R: $dir
-> cd R:\
-> ```
-
 [git long paths]:https://stackoverflow.com/questions/22575662/filename-too-long-in-git-for-windows
 [windows long paths support]:https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry#enable-long-paths-in-windows-10-version-1607-and-later
-[subst]:https://learn.microsoft.com/de-de/windows-server/administration/windows-commands/subst
 [/eng/enable-long-path.reg]:../../eng/enable-long-paths.reg