System.Uri .AbsoluteUri duplicates paths

[TylerLeonhardt]

Pass in a file path with ASCII characters into the Uri constructor and get the AbsoluteUri:

> new Uri("/Users/tyleonha/Code/PowerShell/Misc/foo.ps1").AbsoluteUri
file:///Users/tyleonha/Code/PowerShell/Misc/foo.ps1

Everything looks great. Now pass in a path with non-ASCII characters:

> new Uri("/Users/tyleonha/Code/PowerShell/Misc/测试.ps1").AbsoluteUri
file:///Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1/Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1

The file is url encoded correctly but the file path is duplicated.

Same happens if I pass in the path a Uri string:

new Uri("file:///Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1").AbsoluteUri
file:///Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1/Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1

If I add a drive letter, this no longer repros:

> new Uri("C:/Users/tyleonha/Code/PowerShell/Misc/测试.ps1").AbsoluteUri
file:///C:/Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1

We know that the path passed in is absolute... so I'm a bit confused as to why this duplication is happening.

I'm running this on macOS Mojave with .NET Core 3.1 (via PowerShell).

[TylerLeonhardt]

Related possibly... the ToString() method shows similar (but worse) behavior:

> new Uri("/Users/tyleonha/Code/PowerShell/Misc/测试.ps1").ToString()
file:///Users/tyleonha/Code/PowerShell/Misc/%E6%B5%8B%E8%AF%95.ps1/Users/tyleonha/Code/PowerShell/Misc/测试.ps1

Some of the characters are decoded, some are left as is...

[TylerLeonhardt]

I went as deep as I could with the AbsoluteUri codepath but got to this method (ran with reflection) still gave me the same results... so it's deeper but what this is method is doing is over my head, I'm afraid.

[MihaZupan]

Duplicate of #1061