FIR checker: fix position strategy for UNRESOLVED_LABEL

compiler/fir/analysis-tests/testData/resolve/expresssions/invoke/farInvokeExtension.kt

@@ -2,7 +2,7 @@
 
 fun x() {}
 
-operator fun Int.invoke(): Foo = <!UNRESOLVED_LABEL!>this@Foo<!>
+operator fun Int.invoke(): Foo = this<!UNRESOLVED_LABEL!>@Foo<!>
 
 class Foo {
 

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirDiagnosticsList.kt

@@ -96,7 +96,7 @@ object DIAGNOSTICS_LIST : DiagnosticList("FirErrors") {
         val UNRESOLVED_REFERENCE by error<PsiElement>(PositioningStrategy.REFERENCED_NAME_BY_QUALIFIED) {
             parameter<String>("reference")
         }
-        val UNRESOLVED_LABEL by error<PsiElement>()
+        val UNRESOLVED_LABEL by error<PsiElement>(PositioningStrategy.LABEL)
         val DESERIALIZATION_ERROR by error<PsiElement>()
         val ERROR_FROM_JAVA_RESOLUTION by error<PsiElement>()
         val MISSING_STDLIB_CLASS by error<PsiElement>()

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/model/RegularDiagnosticData.kt

@@ -101,7 +101,7 @@ enum class PositioningStrategy(private val strategy: String? = null) {
     UNREACHABLE_CODE,
     INLINE_PARAMETER_MODIFIER,
     ABSTRACT_MODIFIER,
-
+    LABEL,
     ;
 
     val expressionToCreate get() = "SourceElementPositioningStrategies.${strategy ?: name}"

compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/FirErrors.kt

@@ -127,7 +127,7 @@ object FirErrors {
     // Unresolved
     val INVISIBLE_REFERENCE by error1<PsiElement, FirBasedSymbol<*>>(SourceElementPositioningStrategies.REFERENCE_BY_QUALIFIED)
     val UNRESOLVED_REFERENCE by error1<PsiElement, String>(SourceElementPositioningStrategies.REFERENCED_NAME_BY_QUALIFIED)
-    val UNRESOLVED_LABEL by error0<PsiElement>()
+    val UNRESOLVED_LABEL by error0<PsiElement>(SourceElementPositioningStrategies.LABEL)
     val DESERIALIZATION_ERROR by error0<PsiElement>()
     val ERROR_FROM_JAVA_RESOLUTION by error0<PsiElement>()
     val MISSING_STDLIB_CLASS by error0<PsiElement>()

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/LightTreePositioningStrategies.kt

@@ -898,6 +898,18 @@ object LightTreePositioningStrategies {
             return markElement(nodeToMark ?: node, startOffset, endOffset, tree, node)
         }
     }
+
+    val LABEL: LightTreePositioningStrategy = object : LightTreePositioningStrategy() {
+        override fun mark(
+            node: LighterASTNode,
+            startOffset: Int,
+            endOffset: Int,
+            tree: FlyweightCapableTreeStructure<LighterASTNode>
+        ): List<TextRange> {
+            val nodeToMark = tree.findChildByType(node, KtNodeTypes.LABEL_QUALIFIER) ?: node
+            return markElement(nodeToMark, startOffset, endOffset, tree, node)
+        }
+    }
 }
 
 fun FirSourceElement.hasValOrVar(): Boolean =

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/SourceElementPositioningStrategies.kt

@@ -283,6 +283,11 @@ object SourceElementPositioningStrategies {
         PositioningStrategies.ACTUAL_DECLARATION_NAME
     )
 
+    val LABEL = SourceElementPositioningStrategy(
+        LightTreePositioningStrategies.LABEL,
+        PositioningStrategies.LABEL
+    )
+
     // TODO
     val INCOMPATIBLE_DECLARATION = DEFAULT