Fix URI edge case issue

src/libraries/System.Private.Uri/src/System/Uri.cs

@@ -2702,7 +2702,7 @@ private string GetUnescapedParts(UriComponents uriParts, UriFormat formatAs)
             Debug.Assert(_info != null && (_flags & Flags.MinimalUriInfoSet) != 0);
 
             // Which Uri parts are not escaped canonically ?
-            // Notice that public UriComponents and private Uri.Flags must me in Sync so below code can work
+            // Notice that public UriComponents and private Uri.Flags must be in Sync so below code can work
             //
             ushort nonCanonical = unchecked((ushort)((ushort)_flags & (ushort)Flags.CannotDisplayCanonical));
 
@@ -3297,6 +3297,10 @@ private unsafe void ParseRemaining()
                     {
                         _string = _syntax.SchemeName + SchemeDelimiter;
                     }
+
+                    _info.Offset.Scheme = 0;
+                    _info.Offset.User = (ushort)_string.Length;
+                    _info.Offset.Host = (ushort)_string.Length;
                 }
 
                 _info.Offset.Path = (ushort)_string.Length;

src/libraries/System.Private.Uri/tests/FunctionalTests/UriGetComponentsTest.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections.Generic;
 using Xunit;
 
 namespace System.PrivateUri.Tests
@@ -82,5 +83,43 @@ public void GetComponents_UnknownScheme_LocalHostAndPort_Success()
             Assert.Equal("127.0.0.1", testUri.Host);
             Assert.Equal(23714, testUri.Port);
         }
+
+        public static IEnumerable<object[]> NonAsciiFile_TestData
+        {
+            get
+            {
+                yield return new object[] { "file:///\u00FC", "file:///%C3%BC" };
+                yield return new object[] { "        file:///\u00FC", "file:///%C3%BC" };
+
+                yield return new object[] { "file://C:/\u00FC", "file:///C:/%C3%BC" };
+                yield return new object[] { "file:///C:/\u00FC", "file:///C:/%C3%BC" };
+                yield return new object[] { "        file://C:/\u00FC", "file:///C:/%C3%BC" };
+                yield return new object[] { "        file:///C:/\u00FC", "file:///C:/%C3%BC" };
+
+                yield return new object[] { "C:/\u00FC", "file:///C:/%C3%BC" };
+                yield return new object[] { "        C:/\u00FC", "file:///C:/%C3%BC" };
+
+                if (PlatformDetection.IsNotWindows)
+                {
+                    yield return new object[] { "/\u00FC", "file:///%C3%BC" };
+                    yield return new object[] { "        /\u00FC", "file:///%C3%BC" };
+                }
+            }
+        }
+
+        [Theory]
+        [MemberData(nameof(NonAsciiFile_TestData))]
+        public static void NonAsciiFile(string uriString, string absoluteUri)
+        {
+            Uri testUri = new Uri(uriString);
+
+            Assert.Equal("file", testUri.GetComponents(UriComponents.Scheme, UriFormat.UriEscaped));
+            Assert.Equal("file://", testUri.GetComponents(UriComponents.Scheme | UriComponents.Host, UriFormat.UriEscaped));
+            Assert.Equal("file://", testUri.GetComponents(UriComponents.Scheme | UriComponents.Host | UriComponents.Port, UriFormat.UriEscaped));
+            Assert.Equal("", testUri.GetComponents(UriComponents.UserInfo, UriFormat.UriEscaped));
+            Assert.Equal("", testUri.GetComponents(UriComponents.UserInfo | UriComponents.Host, UriFormat.UriEscaped));
+            Assert.Equal("", testUri.GetComponents(UriComponents.UserInfo | UriComponents.Host | UriComponents.Port, UriFormat.UriEscaped));
+            Assert.Equal(absoluteUri, testUri.GetComponents(UriComponents.AbsoluteUri, UriFormat.UriEscaped));
+        }
     }
 }

src/libraries/System.Private.Uri/tests/FunctionalTests/UriTests.cs

@@ -813,16 +813,18 @@ public static IEnumerable<object[]> FilePathHandlesNonAscii_TestData()
                 // Unix absolute file path
                 yield return new object[] { "/\u00FCri/", "file:///\u00FCri/", "/%C3%BCri/", "file:///%C3%BCri/", "/\u00FCri/" };
                 yield return new object[] { "/a/b\uD83D\uDE1F/Foo.cs", "file:///a/b\uD83D\uDE1F/Foo.cs", "/a/b%F0%9F%98%9F/Foo.cs", "file:///a/b%F0%9F%98%9F/Foo.cs", "/a/b\uD83D\uDE1F/Foo.cs" };
+                yield return new object[] { "\t/\u00FCri/", "file:///\u00FCri/", "/%C3%BCri/", "file:///%C3%BCri/", "/\u00FCri/" };
             }
 
-            // Absolute fie path
+            // Absolute file path
             yield return new object[] { "file:///\u00FCri/", "file:///\u00FCri/", "/%C3%BCri/", "file:///%C3%BCri/", "/\u00FCri/" };
             yield return new object[] { "file:///a/b\uD83D\uDE1F/Foo.cs", "file:///a/b\uD83D\uDE1F/Foo.cs", "/a/b%F0%9F%98%9F/Foo.cs", "file:///a/b%F0%9F%98%9F/Foo.cs", "/a/b\uD83D\uDE1F/Foo.cs" };
 
             // DOS
             yield return new object[] { "file://C:/\u00FCri/", "file:///C:/\u00FCri/", "C:/%C3%BCri/", "file:///C:/%C3%BCri/", "C:\\\u00FCri\\" };
             yield return new object[] { "file:///C:/\u00FCri/", "file:///C:/\u00FCri/", "C:/%C3%BCri/", "file:///C:/%C3%BCri/", "C:\\\u00FCri\\" };
             yield return new object[] { "C:/\u00FCri/", "file:///C:/\u00FCri/", "C:/%C3%BCri/", "file:///C:/%C3%BCri/", "C:\\\u00FCri\\" };
+            yield return new object[] { "\tC:/\u00FCri/", "file:///C:/\u00FCri/", "C:/%C3%BCri/", "file:///C:/%C3%BCri/", "C:\\\u00FCri\\" };
 
             // UNC
             yield return new object[] { "\\\\\u00FCri/", "file://\u00FCri/", "/", "file://\u00FCri/", "\\\\\u00FCri\\" };