Minor fixes after inspecting code-style

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/lib/LibraryUtil.kt

@@ -5,5 +5,5 @@ package org.jetbrains.kotlin.idea.debugger.sequence.lib
  * @author Vitaliy.Bibaev
  */
 object LibraryUtil {
-    val KOTLIN_LANGUAGE_ID = "kotlin"
+    const val KOTLIN_LANGUAGE_ID = "kotlin"
 }

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/lib/sequence/KotlinSequencesSupport.kt

@@ -63,7 +63,7 @@ class KotlinSequencesSupport : LibrarySupportBase() {
     private fun sortedOperations(vararg names: String): Array<IntermediateOperation> =
         names.map { SortedOperation(it) }.toTypedArray()
 
-    private class FilterIsInstanceOperationHandler() : IntermediateOperationBase(
+    private class FilterIsInstanceOperationHandler : IntermediateOperationBase(
         "filterIsInstance", ::FilterIsInstanceHandler,
         SimplePeekCallTraceInterpreter(), FilteredMapResolver()
     )

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/psi/impl/KotlinChainTransformerImpl.kt

@@ -29,11 +29,10 @@ class KotlinChainTransformerImpl(private val typeExtractor: CallTypeExtractor) :
         val intermediateCalls = mutableListOf<IntermediateStreamCall>()
         for (call in callChain.subList(0, callChain.size - 1)) {
             val (typeBefore, typeAfter) = typeExtractor.extractIntermediateCallTypes(call)
-            intermediateCalls += IntermediateStreamCallImpl(call.callName(),
-                                                            call.valueArguments.map { createCallArgument(call, it) },
-                                                            typeBefore,
-                                                            typeAfter,
-                                                            call.textRange
+            intermediateCalls += IntermediateStreamCallImpl(
+                call.callName(), call.valueArguments.map { createCallArgument(call, it) },
+                typeBefore, typeAfter,
+                call.textRange
             )
         }
 

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/psi/impl/TerminatedChainBuilder.kt

@@ -46,7 +46,7 @@ open class TerminatedChainBuilder(
 
             val parentCall = expression.previousCall()
             if (parentCall is KtCallExpression && callChecker.isStreamCall(parentCall)) {
-                myPreviousCalls.put(expression, parentCall)
+                myPreviousCalls[expression] = parentCall
                 updateCallTree(parentCall)
             }
         }
@@ -64,7 +64,7 @@ open class TerminatedChainBuilder(
                     current = myPreviousCalls[current]
                 }
 
-                Collections.reverse(chain)
+                chain.reverse()
                 chains.add(chain)
             }
 

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/trace/impl/handler/collections/FilterCallHandler.kt

@@ -17,10 +17,10 @@ import org.jetbrains.kotlin.idea.debugger.sequence.trace.impl.handler.withArgs
  */
 class FilterCallHandler : BothSemanticsHandler {
     private companion object {
-        val VALUES_ARRAY_NAME = "objectsInPredicate"
-        val PREDICATE_RESULT_ARRAY_NAME = "filteringResults"
+        const val VALUES_ARRAY_NAME = "objectsInPredicate"
+        const val PREDICATE_RESULT_ARRAY_NAME = "filteringResults"
 
-        fun oldPredicateVariableName(order: Int): String = "filterPredicate" + order
+        fun oldPredicateVariableName(order: Int): String = "filterPredicate$order"
     }
 
     override fun variablesDeclaration(call: StreamCall, order: Int, dsl: Dsl): List<VariableDeclaration> {

idea/idea-jvm/src/org/jetbrains/kotlin/idea/debugger/sequence/trace/impl/handler/sequence/KotlinDistinctByHandler.kt

@@ -18,8 +18,8 @@ import org.jetbrains.kotlin.idea.debugger.sequence.trace.dsl.KotlinTypes
  */
 class KotlinDistinctByHandler(callNumber: Int, private val call: IntermediateStreamCall, dsl: Dsl) : HandlerBase.Intermediate(dsl) {
     private companion object {
-        val KEY_EXTRACTOR_VARIABLE_PREFIX = "keyExtractor"
-        val TRANSITIONS_ARRAY_NAME = "transitionsArray"
+        const val KEY_EXTRACTOR_VARIABLE_PREFIX = "keyExtractor"
+        const val TRANSITIONS_ARRAY_NAME = "transitionsArray"
     }
 
     private val peekHandler = PeekTraceHandler(callNumber, "distinctBy", call.typeBefore, call.typeAfter, dsl)