Add support for pattern matching in various cases

[PhenX]

No description provided.

[Copilot]

Pull request overview

Adds generator support (and snapshots) for rewriting additional C# pattern-matching constructs into expression-tree-compatible boolean/conditional expressions, expanding coverage for relational patterns, recursive/property patterns, and C# 14 extension members.

Changes:

• Added generator tests + Verify snapshots covering switch relational patterns and several is-pattern forms (and/or, property patterns, not null) across expression-bodied and block-bodied projectables.
• Implemented ExpressionSyntaxRewriter.VisitIsPatternExpression to rewrite pattern matching into equivalent boolean expressions.
• Added new Verify baseline files for the generated code for the new scenarios (including NET10 extension-member variants).

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 4 comments.

File	Description
tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs	Adds new test cases for pattern matching and extension members.
tests/EntityFrameworkCore.Projectables.Generator.Tests/*.verified.txt	Adds snapshot baselines for newly covered generator outputs.
src/EntityFrameworkCore.Projectables.Generator/ExpressionSyntaxRewriter.cs	Adds pattern-matching rewrite logic for is pattern expressions.

Comments suppressed due to low confidence (1)

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs:3907

• There’s inconsistent indentation on this attribute line compared to the surrounding [Fact] usages, which makes the test file harder to scan and suggests an accidental whitespace change. Align it with the other test methods’ indentation.

               [Fact]
        public Task BlockBodiedMethod_WithRelationalPattern()

---

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[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (2)

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs:3907

• Line has inconsistent indentation before the [Fact] attribute, which makes the test file formatting uneven and can cause noisy diffs on future edits. Please align it with the surrounding attributes.

               [Fact]
        public Task BlockBodiedMethod_WithRelationalPattern()

src/EntityFrameworkCore.Projectables.Generator/ExpressionSyntaxRewriter.cs:335

• visitedGoverning is already computed once at the top of VisitSwitchExpression, but ReplaceVariableWithCast re-visits node.GoverningExpression again (via Visit(governingExpression)). For larger switch expressions this is unnecessary repeated work; consider passing the already-visited governing expression through (or adjusting ReplaceVariableWithCast to accept a visited expression) to avoid extra semantic-model walks.

                if (arm.Pattern is DeclarationPatternSyntax declaration && declaration.Designation is SingleVariableDesignationSyntax)
                {
                    condition = SyntaxFactory.BinaryExpression(SyntaxKind.IsExpression, visitedGoverning, declaration.Type);
                    armExpression = ReplaceVariableWithCast(armExpression, declaration, node.GoverningExpression);
                }

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[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs:3907

• The [Fact] attribute here is mis-indented compared to the rest of the file, which makes the test section harder to scan and is likely unintentional. Please align it with the other attributes/methods.

               [Fact]
        public Task BlockBodiedMethod_WithRelationalPattern()

---

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[Copilot]

Pull request overview

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs:3907

• The [Fact] attribute indentation here is inconsistent with the rest of the file (it appears to have extra leading spaces), which makes the test section harder to scan and can cause style/formatting checks to fail. Please align it with the surrounding attributes/method declarations.

               [Fact]
        public Task BlockBodiedMethod_WithRelationalPattern()

---

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