Propagate nullness flexibility into the result type from type variables in other constraints during result type finding, to prevent variable fixation to less flexible type

^KT-44540 Fixed

compiler/testData/diagnostics/tests/platformTypes/propagateFlexibilityFromOtherConstraints.fir.kt

@@ -0,0 +1,32 @@
+// FULL_JDK
+// FILE: test.kt
+
+@file:Suppress("UNUSED_PARAMETER")
+
+import java.util.Comparator
+
+abstract class DataView {
+    abstract val presentationName: String
+}
+
+fun <A> comboBox(
+    model: SortedComboBoxModel<A>,
+    graphProperty: GraphProperty<A>,
+) {}
+
+class GraphProperty<B>
+
+fun test() {
+    val presentationName: (DataView) -> String = { it.presentationName }
+    val parentComboBoxModel/*: SortedComboBoxModel<DataView>*/ = SortedComboBoxModel(Comparator.comparing(presentationName))
+    comboBox(parentComboBoxModel, GraphProperty<DataView>())
+}
+
+// FILE: SortedComboBoxModel.java
+
+import java.util.Comparator;
+
+public class SortedComboBoxModel<C> {
+    public SortedComboBoxModel(Comparator<? super C> comparator) {
+    }
+}

compiler/testData/diagnostics/tests/platformTypes/propagateFlexibilityFromOtherConstraints.kt

@@ -0,0 +1,32 @@
+// FULL_JDK
+// FILE: test.kt
+
+@file:Suppress("UNUSED_PARAMETER")
+
+import java.util.Comparator
+
+abstract class DataView {
+    abstract val presentationName: String
+}
+
+fun <A> comboBox(
+    model: SortedComboBoxModel<A>,
+    graphProperty: GraphProperty<A>,
+) {}
+
+class GraphProperty<B>
+
+fun test() {
+    val presentationName: (DataView) -> String = { it.presentationName }
+    val parentComboBoxModel/*: SortedComboBoxModel<DataView>*/ = SortedComboBoxModel(Comparator.<!INTERFACE_STATIC_METHOD_CALL_FROM_JAVA6_TARGET_ERROR!>comparing<!>(presentationName))
+    comboBox(parentComboBoxModel, GraphProperty<DataView>())
+}
+
+// FILE: SortedComboBoxModel.java
+
+import java.util.Comparator;
+
+public class SortedComboBoxModel<C> {
+    public SortedComboBoxModel(Comparator<? super C> comparator) {
+    }
+}

compiler/testData/diagnostics/tests/platformTypes/propagateFlexibilityFromOtherConstraints.txt

@@ -0,0 +1,26 @@
+package
+
+public fun </*0*/ A> comboBox(/*0*/ model: SortedComboBoxModel<A>, /*1*/ graphProperty: GraphProperty<A>): kotlin.Unit
+public fun test(): kotlin.Unit
+
+public abstract class DataView {
+    public constructor DataView()
+    public abstract val presentationName: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class GraphProperty</*0*/ B> {
+    public constructor GraphProperty</*0*/ B>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class SortedComboBoxModel</*0*/ C : kotlin.Any!> {
+    public constructor SortedComboBoxModel</*0*/ C : kotlin.Any!>(/*0*/ comparator: java.util.Comparator<in C!>!)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}