[Backport] Fix for #3410-[Trait] Impossible to use from a classTrait a method that is also defined in a subclass of Behavior even when following the doc

src/TraitsV2-Tests/T2OverloadingOfMethodsInTraitedClassTest.class.st

@@ -0,0 +1,79 @@
+Class {
+	#name : #T2OverloadingOfMethodsInTraitedClassTest,
+	#superclass : #T2AbstractTest,
+	#category : #'TraitsV2-Tests-Tests'
+}
+
+{ #category : #tests }
+T2OverloadingOfMethodsInTraitedClassTest >> createT1 [
+	| t1 |
+	t1 := self newTrait: #T1 with: '' asSlotCollection.
+	t1 classTrait
+		compile:
+			'isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest
+		"Should be removed at the end of the test"
+		^true
+	'.
+	TraitedClass
+		compile:
+			'isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest
+		"Should be removed at the end of the test"
+		^false
+	'.
+	Behavior
+		compile:
+			'isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest
+		"Should be removed at the end of the test"
+		^false
+	'.
+	^ t1
+]
+
+{ #category : #tests }
+T2OverloadingOfMethodsInTraitedClassTest >> createT2 [
+	^ self newTrait: #T2 with: '' asSlotCollection
+]
+
+{ #category : #running }
+T2OverloadingOfMethodsInTraitedClassTest >> tearDown [
+	TraitedClass
+		removeSelector: #isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest.
+	Behavior
+		removeSelector: #isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest.
+	super tearDown
+]
+
+{ #category : #tests }
+T2OverloadingOfMethodsInTraitedClassTest >> testDirectTraitSubclassing [
+	| t1 c1 |
+	t1 := self createT1.
+	c1 := self newClass: #C1 with: '' asSlotCollection uses: t1.
+	self
+		assert:
+			c1 isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest
+]
+
+{ #category : #tests }
+T2OverloadingOfMethodsInTraitedClassTest >> testIndirectTraitSubclassing [
+	| t1 t2 superclass subclass |
+	t1 := self createT1.
+	t2 := self createT2.
+	superclass := self
+		newClass: #C2Superclass
+		with: '' asSlotCollection
+		uses: t2.
+
+	subclass := self
+		newClass: #C1Subclass
+		superclass: superclass
+		with: '' asSlotCollection
+		uses: t1.
+	self
+		deny:
+			superclass
+				isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest.
+	self
+		assert:
+			subclass
+				isTrueForUsersOfTheTraitForT2OverloadingOfMethodsInTraitedClassTest
+]

src/TraitsV2/TaClassCompositionElement.class.st

@@ -11,13 +11,21 @@ Class {
 { #category : #accessing }
 TaClassCompositionElement >> methods [
 	"As I am representing a ClassTrait I have to filter the methods that are in all the class traits"
-	^ super methods reject: [ :e | TraitedClass selectors anySatisfy: [ :x | x = e selector ] ]
+	| innerClassLocalMethods |
+	innerClassLocalMethods := innerClass localMethods collect: #selector.
+	^ super methods reject: [ :e | (innerClassLocalMethods includes: e selector) not and: [TraitedClass selectors anySatisfy: [ :x | x = e selector ]] ]
 ]
 
 { #category : #accessing }
 TaClassCompositionElement >> selectors [
 	"As I am representing a ClassTrait I have to filter the methods that are in all the class traits"
-	^ super selectors reject: [ :e | TraitedClass selectors includes: e ]
+
+	| innerClassLocalMethods |
+	innerClassLocalMethods := innerClass localMethods collect: #selector.
+	^ super selectors
+		reject: [ :e | 
+			(innerClassLocalMethods includes: e) not
+				and: [ TraitedClass selectors includes: e ] ]
 ]
 
 { #category : #accessing }

src/TraitsV2/TraitedMetaclass.class.st

@@ -210,22 +210,26 @@ TraitedMetaclass >> isRejectedMethod: aSelector [
 	"The method is not installed in method dictionary if:
 	 - It is in the localMethods.
 	 - It is from Class (we already have them) and they are not overriden in TraitedClass.
-	 - If it is in TraitedClass and it is in my superclass.
+	 - If it is in TraitedClass and it is in my superclass (except if the trait I used defines the selector myself).
 	"
 
-	| isFromClass isFromTraitedClass isMySuperclassTraitedClass |
+	| isFromClass isFromTraitedClass isMySuperclassTraitedClass isTheTraitIUseDefinesTheSelector |
 	(self isLocalSelector: aSelector)
 		ifTrue: [ ^ true ].
 
 	isFromClass := Class canUnderstand: aSelector.
 	isFromTraitedClass := TraitedClass methodDict includesKey: aSelector.
 	isMySuperclassTraitedClass := (superclass isKindOf: TraitedMetaclass) and: [superclass isObsolete not].
-
+
+
 	(isFromClass and: [ isFromTraitedClass not ])
 		ifTrue: [ ^ true ].
 
 	(isFromTraitedClass and: isMySuperclassTraitedClass)
-		ifTrue: [ ^ true ].
+		ifTrue: [
+			isTheTraitIUseDefinesTheSelector := self traitComposition traits anySatisfy: [:inTrait | inTrait localMethods anySatisfy: [ :meth | meth selector = aSelector ]].
+			isTheTraitIUseDefinesTheSelector ifTrue:[ ^false ].
+			 ^ true ].
 
 	^ false
 ]