Current Behavior

The equals contract of Project::equals is broken when comparing against a LifecycleAwareProject: LifecycleAwareProject is equal to its corresponding DefaultProject but not the other way around.

Expected Behavior

equals() must be symmetric

Context (optional)

We have a plugin applied on the root project with an extension that maintains a Set<Project>.
A plugin applied on subprojects checks if the target project is contained in that set.

As of Gradle 8.10, the set now contains LifecycleAwareProjects and a contains(defaultProject) check always fails.

Also identity equality is not reliably anymore because of LifecycleAwareProject (e.g. in Java code: project.getParent() == project.getRootProject()). This changed behavior is understandable but might be good to document it in the release notes.

Steps to Reproduce

/build.gradle.kts

project.ext["subproject"] = subprojects.toList()[0]

/subproject/build.gradle.kts

val lifecycleAware = rootProject.ext["subproject"]!!
println("$lifecycleAware (${lifecycleAware.javaClass}")
println("$project (${project.javaClass}")

println(lifecycleAware == project)
println(project == lifecycleAware)

This prints

> Configure project :subproject
project ':subproject' (class org.gradle.api.internal.project.LifecycleAwareProject_Decorated
project ':subproject' (class org.gradle.api.internal.project.DefaultProject_Decorated
true
false

Gradle version

8.10

Build scan URL (optional)

No response

Your Environment (optional)

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