[Assign plugin] Use FqName to match annotations in FirAssignAnnotationMatchingService

All other compiler plugins accept "pkg1.pkg2.Class1" classes notation
and correctly match against it

But Assignment plugin used `ClassId` on such qualified names and got
`ClassId("/pkg1.pkg2.Class1")` instead of `ClassId("pkg1/pkg2/Class1")`,
and that lead to unexpected problems

This commit fixes that by using `FqName` instead of `ClassId`

^KT-57406 Fixed

plugins/assign-plugin/assign-plugin.k2/src/org/jetbrains/kotlin/assignment/plugin/k2/FirAssignAnnotationMatchingService.kt

@@ -15,16 +15,16 @@ import org.jetbrains.kotlin.fir.extensions.FirExtensionSessionComponent.Factory
 import org.jetbrains.kotlin.fir.resolve.fullyExpandedType
 import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
 import org.jetbrains.kotlin.fir.types.toRegularClassSymbol
-import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
 
 internal class FirAssignAnnotationMatchingService(
     session: FirSession,
-    private val annotationClassIds: List<ClassId>
+    private val annotationClassIds: List<FqName>
 ) : FirExtensionSessionComponent(session) {
 
     companion object {
         fun getFactory(annotations: List<String>): Factory {
-            return Factory { session -> FirAssignAnnotationMatchingService(session, annotations.map { ClassId.fromString(it) }) }
+            return Factory { session -> FirAssignAnnotationMatchingService(session, annotations.map { FqName(it) }) }
         }
     }
 
@@ -40,10 +40,10 @@ internal class FirAssignAnnotationMatchingService(
     }
 
     private fun FirRegularClassSymbol.annotated(): Boolean {
-        if (this.annotations.any { it.toAnnotationClassId(session) in annotationClassIds }) return true
+        if (this.annotations.any { it.toAnnotationClassId(session)?.asSingleFqName() in annotationClassIds }) return true
         return resolvedSuperTypeRefs.any { superTypeRef ->
             val symbol = superTypeRef.type.fullyExpandedType(session).toRegularClassSymbol(session) ?: return@any false
-            symbol.annotations.any { it.toAnnotationClassId(session) in annotationClassIds }
+            symbol.annotations.any { it.toAnnotationClassId(session)?.asSingleFqName() in annotationClassIds }
         }
     }
 }

plugins/assign-plugin/test/org/jetbrains/kotlin/assignment/plugin/AssignmentPluginTests.kt

@@ -72,7 +72,10 @@ fun TestConfigurationBuilder.configureDiagnostics() {
 
 class AssignmentPluginEnvironmentConfigurator(testServices: TestServices) : EnvironmentConfigurator(testServices) {
     companion object {
-        private val TEST_ANNOTATIONS = listOf("ValueContainer")
+        private val TEST_ANNOTATIONS = listOf(
+            "ValueContainer",
+            "qualified.ValueContainer",
+        )
     }
 
     @OptIn(InternalNonStableExtensionPoints::class)

plugins/assign-plugin/testData/codegen/qualifiedAnnotation.kt

@@ -0,0 +1,22 @@
+// FILE: annotation.kt
+package qualified
+
+annotation class ValueContainer
+
+// FILE: main.kt
+import qualified.ValueContainer
+
+@ValueContainer
+class StringProperty(var v: String) {
+    fun assign(v: String) {
+        this.v = v
+    }
+}
+
+val property = StringProperty("Initial")
+
+fun box(): String {
+    property = "OK"
+
+    return property.v
+}

plugins/assign-plugin/tests-gen/org/jetbrains/kotlin/assignment/plugin/FirLightTreeBlackBoxCodegenTestForAssignmentPluginGenerated.java

@@ -43,6 +43,12 @@ public class FirLightTreeBlackBoxCodegenTestForAssignmentPluginGenerated extends
         runTest("plugins/assign-plugin/testData/codegen/plusAssignPrecedence.kt");
     }
 
+    @Test
+    @TestMetadata("qualifiedAnnotation.kt")
+    public void testQualifiedAnnotation() throws Exception {
+        runTest("plugins/assign-plugin/testData/codegen/qualifiedAnnotation.kt");
+    }
+
     @Test
     @TestMetadata("supportedUsage.kt")
     public void testSupportedUsage() throws Exception {

plugins/assign-plugin/tests-gen/org/jetbrains/kotlin/assignment/plugin/IrBlackBoxCodegenTestAssignmentPluginGenerated.java

@@ -43,6 +43,12 @@ public class IrBlackBoxCodegenTestAssignmentPluginGenerated extends AbstractIrBl
         runTest("plugins/assign-plugin/testData/codegen/plusAssignPrecedence.kt");
     }
 
+    @Test
+    @TestMetadata("qualifiedAnnotation.kt")
+    public void testQualifiedAnnotation() throws Exception {
+        runTest("plugins/assign-plugin/testData/codegen/qualifiedAnnotation.kt");
+    }
+
     @Test
     @TestMetadata("supportedUsage.kt")
     public void testSupportedUsage() throws Exception {