Remove ItemCollection from TagHelperDescriptorProviderContext #10720
Commits on Aug 8, 2024
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Make Compilation a TagHelperDescriptorProviderContext property
Every single `TagHelperDescriptorProviderContext` created in Razor compiler or tooling code adds a valid compilation. So, adding the compilation to the `ItemsCollection` is pure overhead and no `ITagHelperDescriptorProvider` needs to check it for null. I removed a single test that verified the behavior if a compilation was never set. Now that a compilation is required, this test is no longer needed.
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Remove TagHelperDescriptorProviderContext.Items property
This can be safely removed now that there are no more references.
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Clean up all ITagHelperDescriptorProviders a bit (and found a bug!)
- Enable nullability - Mark all as sealed - Use `Lazy<T>` for singleton `ITagHelperDescriptorProviders` - Introduce `TagHelperDescriptorProviderBase` - Inherit from `TagHelperDescriptorProviderBase` - Remove unnecessary properties - Remove unnecessary property setters In addition, I spotted a bug in `EventHandlerTagDescriptorProvider` while addressing nullability warnings. The buggy code is right here: https://github.com/dotnet/razor/blob/fb84ae5d9bb8132972c2c23cf209721161f81deb/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/CSharp/EventHandlerTagHelperDescriptorProvider.cs#L70-L76 When reading the constructor arguments of an `EventHandlerAttribute` it appears that we swap the last two arguments of the 4-argument variant. The constructor is defined like so: ```C# EventHandlerAttribute(string attributeName, Type eventArgsType, bool enableStopPropagation, bool enablePreventDefault); ``` Unfortunately, the compiler reads the third parameter as `enablePreventDefaeult` and the fourth parameter as `enableStopPropagation`. This has been broken since support for the 4-argument constructor variant was added in dotnet@7635bba. Fixing this bug is tracked by dotnet#10497.
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