Implement quickfix for wrong long suffix

Fixes: KT-13134

idea/src/org/jetbrains/kotlin/idea/quickfix/QuickFixRegistrar.kt

@@ -398,5 +398,7 @@ class QuickFixRegistrar : QuickFixContributor {
         SUPERTYPE_IS_EXTENSION_FUNCTION_TYPE.registerFactory(ConvertExtensionToFunctionTypeFix)
 
         UNUSED_LAMBDA_EXPRESSION.registerFactory(AddRunToLambdaFix)
+
+        WRONG_LONG_SUFFIX.registerFactory(WrongLongSuffixFix)
     }
 }

idea/src/org/jetbrains/kotlin/idea/quickfix/WrongLongSuffixFix.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.quickfix
+
+import com.intellij.codeInsight.intention.IntentionAction
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.diagnostics.Diagnostic
+import org.jetbrains.kotlin.diagnostics.Errors
+import org.jetbrains.kotlin.psi.KtConstantExpression
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.KtPsiFactory
+
+class WrongLongSuffixFix(element: KtConstantExpression) : KotlinQuickFixAction<KtConstantExpression>(element) {
+
+    private val corrected = element.text.trimEnd('l') + 'L'
+
+    override fun getText() = "Change to '$corrected'"
+    override fun getFamilyName() = "Change to correct long suffix 'L'"
+
+    override fun invoke(project: Project, editor: Editor?, file: KtFile) {
+        element.replace(KtPsiFactory(project).createExpression(corrected))
+    }
+
+    companion object Factory: KotlinSingleIntentionActionFactory() {
+        override fun createAction(diagnostic: Diagnostic): IntentionAction {
+            val casted = Errors.WRONG_LONG_SUFFIX.cast(diagnostic)
+            return WrongLongSuffixFix(casted.psiElement)
+        }
+    }
+}