Fix Blazor [Parameter] public code fix handling of multiple access modifiers

[damyanpetev]

Fix Blazor [Parameter] public code fix handling of multiple access modifiers

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Changed to logic to rebuild the newModifiers collection with .Add() and filtering out existing access modifiers to avoid modification issues of the existing .Remove() use with more than one access modifier.

Description

ComponentParametersShouldBePublicCodeFixProvider was modifying the SyntaxTokenList while iterating, causing attempts to remove beyond the first to fail, leaving resulting code in wrong state with likely compiler errors.

The came from looking at the comment about private public protected int Foo { get; set; } which unfortunately, besides sitting on an IDE Modifiers are not orderedIDE0036 warning, is causing an More than one protection modifier CS0107 so I can't really get that scenario to even trigger the code fix. While it'll likely fix it fine, I've removed the comment since the refactored logic no longer needs the explanation.

Fixes #67364

[dotnet-policy-service]

Thanks for your PR, @damyanpetev. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull request overview

This PR fixes the Blazor analyzer code fix (BL0004) that updates [Parameter] properties to public so it correctly handles members that have multiple access modifiers (e.g., private protected, protected internal) without leaving behind an extra access modifier that would produce invalid code.

Changes:

• Reworked the code fix modifier rewrite logic to build a fresh SyntaxTokenList starting with public and then re-add only non-access modifiers.
• Added regression tests covering valid multi-access-modifier cases and a mixed-modifier case (protected new internal) to ensure non-access modifiers are preserved.
• Applied the same fix and tests in both the in-box analyzers and the SDK analyzers copies.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Components/Analyzers/src/ComponentParametersShouldBePublicCodeFixProvider.cs	Rebuilds modifier list to remove all access modifiers and insert public reliably.
src/Components/Analyzers/test/ComponentParametersShouldBePublicCodeFixProviderTest.cs	Adds coverage for multi-access-modifier parameter properties and preservation of new.
src/Tools/SDK-Analyzers/Components/src/ComponentParametersShouldBePublicCodeFixProvider.cs	Mirrors the same modifier list rebuild fix for the SDK analyzers variant.
src/Tools/SDK-Analyzers/Components/test/ComponentParametersShouldBePublicCodeFixProviderTest.cs	Mirrors the same multi-modifier regression tests for the SDK analyzers variant.

[dariatiurina]

This is amazing! Thank you so much for your work! 💕

[dariatiurina]

Reapply approve