Process FirErrorResolvedQualifiers in KtFirReferenceShortener

Also, add `classId` default value to the `FirErrorResolvedQualifierImpl`
just as in `FirResolvedQualifierImpl` - it seemed inconsistent that
we can have a class symbol in error-resolved qualifier, but the
`classId` field will be `null`

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/expressions/builder/FirErrorResolvedQualifierBuilder.kt

@@ -34,7 +34,6 @@ class FirErrorResolvedQualifierBuilder : FirAbstractResolvedQualifierBuilder, Fi
     override val annotations: MutableList<FirAnnotationCall> = mutableListOf()
     override lateinit var packageFqName: FqName
     override var relativeClassFqName: FqName? = null
-    override var classId: ClassId? = null
     override var symbol: FirClassLikeSymbol<*>? = null
     override var isNullableLHSForCallableReference: Boolean = false
     override val nonFatalDiagnostics: MutableList<ConeDiagnostic> = mutableListOf()
@@ -47,7 +46,6 @@ class FirErrorResolvedQualifierBuilder : FirAbstractResolvedQualifierBuilder, Fi
             annotations,
             packageFqName,
             relativeClassFqName,
-            classId,
             symbol,
             isNullableLHSForCallableReference,
             nonFatalDiagnostics,
@@ -64,6 +62,13 @@ class FirErrorResolvedQualifierBuilder : FirAbstractResolvedQualifierBuilder, Fi
             throw IllegalStateException()
         }
 
+    @Deprecated("Modification of 'classId' has no impact for FirErrorResolvedQualifierBuilder", level = DeprecationLevel.HIDDEN)
+    override var classId: ClassId?
+        get() = throw IllegalStateException()
+        set(_) {
+            throw IllegalStateException()
+        }
+
     @Deprecated("Modification of 'resolvedToCompanionObject' has no impact for FirErrorResolvedQualifierBuilder", level = DeprecationLevel.HIDDEN)
     override var resolvedToCompanionObject: Boolean
         get() = throw IllegalStateException()

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/expressions/impl/FirErrorResolvedQualifierImpl.kt

@@ -27,7 +27,6 @@ internal class FirErrorResolvedQualifierImpl(
     override val annotations: MutableList<FirAnnotationCall>,
     override val packageFqName: FqName,
     override val relativeClassFqName: FqName?,
-    override val classId: ClassId?,
     override val symbol: FirClassLikeSymbol<*>?,
     override var isNullableLHSForCallableReference: Boolean,
     override val nonFatalDiagnostics: MutableList<ConeDiagnostic>,
@@ -35,6 +34,9 @@ internal class FirErrorResolvedQualifierImpl(
     override val diagnostic: ConeDiagnostic,
 ) : FirErrorResolvedQualifier() {
     override var typeRef: FirTypeRef = FirImplicitTypeRefImpl(null)
+    override val classId: ClassId? get() = relativeClassFqName?.let {
+    ClassId(packageFqName, it, false)
+}
     override val resolvedToCompanionObject: Boolean get() = false
 
     override fun <R, D> acceptChildren(visitor: FirVisitor<R, D>, data: D) {

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -276,14 +276,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
 
         impl(resolvedQualifier) {
             isMutable("packageFqName", "relativeClassFqName", "isNullableLHSForCallableReference")
-            default("classId") {
-                value = """
-                    |relativeClassFqName?.let {
-                    |    ClassId(packageFqName, it, false)
-                    |}
-                """.trimMargin()
-                withGetter = true
-            }
+            defaultClassIdFromRelativeClassName()
         }
 
         impl(resolvedReifiedParameterReference)
@@ -495,6 +488,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
 
         impl(errorResolvedQualifier) {
             defaultFalse("resolvedToCompanionObject", withGetter = true)
+            defaultClassIdFromRelativeClassName()
         }
 
         noImpl(userTypeRef)
@@ -574,4 +568,17 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
             useTypes(implicitTypeRefType)
         }
     }
+
+    private fun ImplementationContext.defaultClassIdFromRelativeClassName() {
+        default("classId") {
+            value = """
+                |relativeClassFqName?.let {
+                |    ClassId(packageFqName, it, false)
+                |}
+                """.trimMargin()
+            withGetter = true
+        }
+    }
 }
+
+

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirReferenceShortener.kt

@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.fir.declarations.FirRegularClass
 import org.jetbrains.kotlin.fir.declarations.FirResolvedImport
 import org.jetbrains.kotlin.fir.declarations.builder.buildImport
 import org.jetbrains.kotlin.fir.declarations.builder.buildResolvedImport
+import org.jetbrains.kotlin.fir.expressions.FirErrorResolvedQualifier
 import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
 import org.jetbrains.kotlin.fir.expressions.FirResolvedQualifier
 import org.jetbrains.kotlin.fir.expressions.impl.FirNoReceiverExpression
@@ -317,6 +318,12 @@ private class ElementsToShortenCollector(
         processTypeQualifier(resolvedQualifier)
     }
 
+    override fun visitErrorResolvedQualifier(errorResolvedQualifier: FirErrorResolvedQualifier) {
+        super.visitErrorResolvedQualifier(errorResolvedQualifier)
+
+        processTypeQualifier(errorResolvedQualifier)
+    }
+
     override fun visitResolvedNamedReference(resolvedNamedReference: FirResolvedNamedReference) {
         super.visitResolvedNamedReference(resolvedNamedReference)