Fix TryDotnet issue "Compile errors are duplicated in output"

dotnet / interactive

.NET Interactive combines the power of .NET with many other languages to create notebooks, REPLs, and embedded coding experiences. Share code, explore data, write, and learn across your apps in ways you couldn't before.

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Fix TryDotnet issue "Compile errors are duplicated in output" #3572

Closed ocallesp closed 2 weeks ago

ocallesp commented 2 weeks ago

Fixes https://github.com/dotnet/try/issues/1184

This fixes a bug in TryDotNet that occurs when a user enters invalid code.

Ensured project diagnostics are added only if their Id is not already present in the main diagnostics collection