[FIR] Relax MULTIPLE_DEFAULTS_* to account for the K1 behavior

^KT-56442
^KT-36188

compiler/testData/diagnostics/tests/falseNegativeDuplicateDefaultValues1.fir.kt

@@ -11,5 +11,5 @@ open class Keker<P> {
 }
 
 class Implementation<P>() : Keker<P>(), SomeRandomOverride<P> {
-    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES!>props: Int<!>) {}
+    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_WARNING!>props: Int<!>) {}
 }

compiler/testData/diagnostics/tests/falseNegativeDuplicateDefaultValues1_error.fir.kt

@@ -0,0 +1,16 @@
+// LANGUAGE: +ProhibitAllMultipleDefaultsInheritedFromSupertypes
+// ISSUE: KT-36188
+
+interface SomeRandomBase<K> {
+    fun child(props: Int = 20)
+}
+
+interface SomeRandomOverride<J> : SomeRandomBase<J>
+
+open class Keker<P> {
+    open fun child(props: Int = 10) {}
+}
+
+class Implementation<P>() : Keker<P>(), SomeRandomOverride<P> {
+    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_ERROR!>props: Int<!>) {}
+}

compiler/testData/diagnostics/tests/falseNegativeDuplicateDefaultValues1_error.kt

@@ -0,0 +1,16 @@
+// LANGUAGE: +ProhibitAllMultipleDefaultsInheritedFromSupertypes
+// ISSUE: KT-36188
+
+interface SomeRandomBase<K> {
+    fun child(props: Int = 20)
+}
+
+interface SomeRandomOverride<J> : SomeRandomBase<J>
+
+open class Keker<P> {
+    open fun child(props: Int = 10) {}
+}
+
+class Implementation<P>() : Keker<P>(), SomeRandomOverride<P> {
+    override fun child(props: Int) {}
+}

compiler/testData/diagnostics/tests/falseNegativeDuplicateDefaultValues2.fir.kt

@@ -13,5 +13,5 @@ open class Keker<P> {
 }
 
 class Implementation<P>() : Keker<P>(), SomeRandomOverride<P> {
-    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES!>props: Int<!>) {}
+    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_WARNING!>props: Int<!>) {}
 }

compiler/testData/diagnostics/tests/falseNegativeDuplicateDefaultValues3.fir.kt

@@ -13,5 +13,5 @@ open class Keker<P> {
 }
 
 class Implementation<P>() : Keker<P>(), SomeRandomOverride<P> {
-    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES!>props: Int<!>) {}
+    override fun child(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_WARNING!>props: Int<!>) {}
 }

compiler/testData/diagnostics/tests/missingMultipleDefaultsOnTransitiveInheritance1.fir.kt

@@ -0,0 +1,23 @@
+// ISSUE: KT-60269
+// WITH_STDLIB
+
+interface Foo {
+    fun foo(param: Int = 1)
+}
+
+interface Bar {
+    fun foo(param: Int = 2)
+}
+
+interface Baz1 : Bar
+
+class Baz : Baz1, Foo {
+    override fun foo(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_WARNING!>param: Int<!>) {
+        println(param)
+    }
+}
+
+fun main() {
+    Baz().foo()
+    (Baz() as Foo).foo()
+}

compiler/testData/diagnostics/tests/missingMultipleDefaultsOnTransitiveInheritance1.kt

@@ -0,0 +1,23 @@
+// ISSUE: KT-60269
+// WITH_STDLIB
+
+interface Foo {
+    fun foo(param: Int = 1)
+}
+
+interface Bar {
+    fun foo(param: Int = 2)
+}
+
+interface Baz1 : Bar
+
+class Baz : Baz1, Foo {
+    override fun foo(param: Int) {
+        println(param)
+    }
+}
+
+fun main() {
+    Baz().foo()
+    (Baz() as Foo).foo()
+}

compiler/testData/diagnostics/tests/missingMultipleDefaultsOnTransitiveInheritance2.kt

@@ -0,0 +1,22 @@
+// FIR_IDENTICAL
+// ISSUE: KT-60269
+// WITH_STDLIB
+
+interface Foo {
+    fun foo(param: Int = 1)
+}
+
+interface Bar {
+    fun foo(param: Int = 2)
+}
+
+class Baz : Bar, Foo {
+    override fun foo(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES!>param: Int<!>) {
+        println(param)
+    }
+}
+
+fun main() {
+    Baz().foo()
+    (Baz() as Foo).foo()
+}

compiler/testData/diagnostics/tests/moreThanOneOverriddenMissingK2.kt

@@ -0,0 +1,19 @@
+// FIR_IDENTICAL
+// ISSUE: KT-57076
+// WITH_STDLIB
+
+interface I01 {
+    fun some(x: Int = 1, y: Int)
+}
+
+open class C01 {
+    open fun some(x: Int = -1, y: Int = 2) {
+        println("x = $x y = $y")
+    }
+}
+
+<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE!>class C02<!>: C01(), I01
+
+fun main(){
+    C02().some() // K2: x = -1 y = 2
+}

compiler/testData/diagnostics/tests/multipleDefaultsIncorrectlyAllowed1.kt

@@ -0,0 +1,14 @@
+// FIR_IDENTICAL
+// ISSUE: KT-36188
+
+interface A {
+    fun foo(a: String = "Fail"): String
+}
+interface B {
+    fun foo(a: String = "OK"): String
+}
+class Impl : A, B {
+    override fun foo(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES!>a: String<!>) = a
+}
+
+fun box(): String = Impl().foo()

compiler/testData/diagnostics/tests/multipleDefaultsIncorrectlyAllowed2.fir.kt

@@ -0,0 +1,14 @@
+// ISSUE: KT-36188
+
+interface A {
+    fun foo(a: String = "Fail"): String
+}
+interface A2 : A
+interface B {
+    fun foo(a: String = "OK"): String
+}
+class Impl : A2, B {
+    override fun foo(<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_DEPRECATION_WARNING!>a: String<!>) = a
+}
+
+fun box(): String = Impl().foo()

compiler/testData/diagnostics/tests/multipleDefaultsIncorrectlyAllowed2.kt

@@ -0,0 +1,14 @@
+// ISSUE: KT-36188
+
+interface A {
+    fun foo(a: String = "Fail"): String
+}
+interface A2 : A
+interface B {
+    fun foo(a: String = "OK"): String
+}
+class Impl : A2, B {
+    override fun foo(a: String) = a
+}
+
+fun box(): String = Impl().foo()