unescape view names in region navigation (#3388)

Ensures that view names containing diacritics, such as umlauts, are correctly resolved by unescaping the URI path during region navigation.

Author: brianlagunas

src/Maui/Prism.Maui/Navigation/Regions/Navigation/RegionNavigationContentLoader.cs

@@ -91,7 +91,7 @@ protected virtual string GetContractFromNavigationContext(NavigationContext navi
 
         var candidateTargetContract = UriParsingHelper.EnsureAbsolute(navigationContext.Uri).AbsolutePath;
         candidateTargetContract = candidateTargetContract.TrimStart('/');
-        return candidateTargetContract;
+        return Uri.UnescapeDataString(candidateTargetContract);
     }
 
     /// <summary>

src/Wpf/Prism.Wpf/Navigation/Regions/RegionNavigationContentLoader.cs

@@ -125,7 +125,7 @@ protected virtual string GetContractFromNavigationContext(NavigationContext navi
 
             var candidateTargetContract = UriParsingHelper.GetAbsolutePath(navigationContext.Uri);
             candidateTargetContract = candidateTargetContract.TrimStart('/');
-            return candidateTargetContract;
+            return Uri.UnescapeDataString(candidateTargetContract);
         }
 
         /// <summary>

tests/Maui/Prism.Maui.Tests/Fixtures/Common/UriParsingHelperFixture.cs

@@ -232,4 +232,27 @@ public void ParseForDeepLinkRelativeUri()
         Assert.Equal(_deepLinkRelativeUri, uri.OriginalString);
         Assert.False(uri.IsAbsoluteUri);
     }
+
+    [Theory]
+    [InlineData("TestäöüView")]
+    [InlineData("MøbëlList")]
+    [InlineData("Ñoño")]
+    public void GetAbsolutePathUnescapesDiacritics(string viewName)
+    {
+        var uri = UriParsingHelper.Parse(viewName);
+        var absolutePath = UriParsingHelper.GetAbsolutePath(uri);
+        var result = Uri.UnescapeDataString(absolutePath.TrimStart('/'));
+        Assert.Equal(viewName, result);
+    }
+
+    [Theory]
+    [InlineData("TestäöüView")]
+    [InlineData("MøbëlList")]
+    public void GetUriSegmentsUnescapesDiacritics(string viewName)
+    {
+        var uri = new Uri(viewName, UriKind.Relative);
+        var segments = UriParsingHelper.GetUriSegments(uri);
+        var segmentName = UriParsingHelper.GetSegmentName(segments.Dequeue());
+        Assert.Equal(viewName, segmentName);
+    }
 }