FIR IDE: Fix completion in case of function with parameters

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirSimpleFunctionBuilder.kt

@@ -85,3 +85,27 @@ inline fun buildSimpleFunction(init: FirSimpleFunctionBuilder.() -> Unit): FirSi
     }
     return FirSimpleFunctionBuilder().apply(init).build()
 }
+
+@OptIn(ExperimentalContracts::class)
+inline fun buildSimpleFunctionCopy(original: FirSimpleFunction, init: FirSimpleFunctionBuilder.() -> Unit): FirSimpleFunction {
+    contract {
+        callsInPlace(init, kotlin.contracts.InvocationKind.EXACTLY_ONCE)
+    }
+    val copyBuilder = FirSimpleFunctionBuilder()
+    copyBuilder.source = original.source
+    copyBuilder.session = original.session
+    copyBuilder.resolvePhase = original.resolvePhase
+    copyBuilder.origin = original.origin
+    copyBuilder.returnTypeRef = original.returnTypeRef
+    copyBuilder.receiverTypeRef = original.receiverTypeRef
+    copyBuilder.valueParameters.addAll(original.valueParameters)
+    copyBuilder.body = original.body
+    copyBuilder.status = original.status
+    copyBuilder.containerSource = original.containerSource
+    copyBuilder.contractDescription = original.contractDescription
+    copyBuilder.name = original.name
+    copyBuilder.symbol = original.symbol
+    copyBuilder.annotations.addAll(original.annotations)
+    copyBuilder.typeParameters.addAll(original.typeParameters)
+    return copyBuilder.apply(init).build()
+}

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

@@ -269,6 +269,7 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
             default("contractDescription", "FirEmptyContractDescription")
             useTypes(emptyContractDescriptionType)
             openBuilder()
+            withCopy()
         }
 
         builder(tryExpression) {