Add AlsoNotify support to ReactiveAttribute and generator

[ChrisPulman]

What kind of change does this PR introduce?

feature

What is the current behavior?

Unable to include other related properties for change notifications

What is the new behavior?

Introduces the AlsoNotify parameter to the ReactiveAttribute, allowing additional property change notifications to be specified.

Updates the source generator to handle AlsoNotify, emitting RaisePropertyChanged calls for the specified properties in generated setters.

Includes new and updated tests to verify the new behavior, and updates documentation to describe the new feature.

What might this PR break?

New feature

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

❌ Patch coverage is 55.10204% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.07%. Comparing base (f8a5eca) to head (37a422f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ators.Roslyn/Reactive/ReactiveGenerator.Execute.cs	33.33%	20 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   42.86%   43.07%   +0.20%     
==========================================
  Files          64       64              
  Lines        3583     3626      +43     
  Branches      404      411       +7     
==========================================
+ Hits         1536     1562      +26     
- Misses       1935     1949      +14     
- Partials      112      115       +3     

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[Copilot]

Pull request overview

This PR adds AlsoNotify support to the ReactiveAttribute, enabling developers to specify additional properties that should receive change notifications when a reactive property changes. The implementation updates the source generator to handle the new parameter and emit additional RaisePropertyChanged calls in generated property setters.

Key Changes:

• Added constructor and AlsoNotify property to ReactiveAttribute for specifying additional notification targets
• Updated generator to parse and filter AlsoNotify parameters, excluding empty/null values and self-references
• Modified property generation templates to include additional RaisePropertyChanged calls in setters

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 27 comments.

Show a summary per file

File	Description
src/ReactiveUI.SourceGenerators.Roslyn/AttributeDefinitions.cs	Adds constructor and AlsoNotify property to ReactiveAttribute for both property and field target variants
src/ReactiveUI.SourceGenerators.Roslyn/Reactive/ReactiveGenerator.Execute.cs	Implements AlsoNotify parsing logic and updates property generation templates to include additional notification calls
src/ReactiveUI.SourceGenerators.Roslyn/Reactive/Models/PropertyInfo.cs	Adds AlsoNotify parameter to PropertyInfo record to store notification targets
src/ReactiveUI.SourceGenerators.Execute/TestViewModel.cs	Demonstrates AlsoNotify usage with multiple property notifications
src/ReactiveUI.SourceGenerator.Tests/UnitTests/ReactiveGeneratorTests.cs	Adds test case for AlsoNotify feature verification
src/ReactiveUI.SourceGenerator.Tests/REACTIVE/*.verified.cs	Updates all verified test outputs to reflect new setter format with block syntax instead of expression syntax
README.md	Documents new AlsoNotify feature with usage example

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.