[Analysis API] fix "KotlinIllegalStateExceptionWithAttachments: expected as maximum one expect for the actual"

^KT-61597 fixed

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/components/KtMultiplatformInfoProvider.kt

@@ -9,15 +9,16 @@ import org.jetbrains.kotlin.analysis.api.lifetime.withValidityAssertion
 import org.jetbrains.kotlin.analysis.api.symbols.KtDeclarationSymbol
 
 public abstract class KtMultiplatformInfoProvider : KtAnalysisSessionComponent() {
-    public abstract fun getExpectForActual(actual: KtDeclarationSymbol): KtDeclarationSymbol?
+    public abstract fun getExpectForActual(actual: KtDeclarationSymbol): List<KtDeclarationSymbol>
 }
 
 public interface KtMultiplatformInfoProviderMixin : KtAnalysisSessionMixIn {
 
     /**
      * Gives expect symbol for the actual one if it is available.
+     *
+     * @return a single expect declaration corresponds to the [KtDeclarationSymbol] on valid code or multiple expects in a case of erroneous code with multiple expects.
      **/
-    public fun KtDeclarationSymbol.getExpectForActual(): KtDeclarationSymbol? =
+    public fun KtDeclarationSymbol.getExpectsForActual(): List<KtDeclarationSymbol> =
         withValidityAssertion { analysisSession.multiplatformInfoProvider.getExpectForActual(this) }
-
 }

analysis/analysis-api/testData/components/multiplatformInfoProvider/expectForActual/actual_object.descriptors.txt

@@ -1 +1,2 @@
-expected symbol: null
+expected symbols:
+

analysis/analysis-api/testData/components/multiplatformInfoProvider/expectForActual/actual_object.txt

@@ -1 +1,2 @@
-expected symbol: Common.kt : object Platform
+expected symbols:
+Common.kt : object Platform

analysis/analysis-api/testData/components/multiplatformInfoProvider/expectForActual/multipleExpects.descriptors.txt

@@ -0,0 +1 @@
+expected symbols:

analysis/analysis-api/testData/components/multiplatformInfoProvider/expectForActual/multipleExpects.kt

@@ -0,0 +1,19 @@
+// !LANGUAGE: +MultiPlatformProjects
+
+// MODULE: commonMain1
+// FILE: Common1.kt
+
+package sample
+expect fun foo()
+
+// MODULE: commonMain2
+// FILE: Common2.kt
+
+package sample
+expect fun foo()
+
+// MODULE: androidMain(commonMain1, commonMain2)
+// FILE: JvmAndroid.kt
+
+package sample
+actual fun f<caret>oo() {}

analysis/analysis-api/testData/components/multiplatformInfoProvider/expectForActual/multipleExpects.txt

@@ -0,0 +1,3 @@
+expected symbols:
+Common1.kt : fun foo()
+Common2.kt : fun foo()