Scripts: drop sdk caches on project root change event

Otherwise old invalid roots may be saved

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ScriptsCompilationConfigurationCache.kt

@@ -1,26 +1,18 @@
 /*
- * Copyright 2010-2017 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.
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.idea.core.script
 
+import com.intellij.ProjectTopics
 import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer
 import com.intellij.openapi.extensions.Extensions
 import com.intellij.openapi.module.ModuleManager
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.projectRoots.Sdk
+import com.intellij.openapi.roots.ModuleRootEvent
+import com.intellij.openapi.roots.ModuleRootListener
 import com.intellij.openapi.roots.ModuleRootManager
 import com.intellij.openapi.roots.OrderRootType
 import com.intellij.openapi.vfs.VirtualFile
@@ -48,6 +40,15 @@ class ScriptsCompilationConfigurationCache(private val project: Project) {
         const val MAX_SCRIPTS_CACHED = 50
     }
 
+    init {
+        val connection = project.messageBus.connect()
+        connection.subscribe(ProjectTopics.PROJECT_ROOTS, object : ModuleRootListener {
+            override fun rootsChanged(event: ModuleRootEvent) {
+                clearCaches()
+            }
+        })
+    }
+
     private val cacheLock = ReentrantReadWriteLock()
 
     private val scriptDependenciesCache = SLRUCacheWithLock<ScriptCompilationConfigurationResult>()
@@ -126,6 +127,11 @@ class ScriptsCompilationConfigurationCache(private val project: Project) {
     }
 
     private fun onChange(files: List<VirtualFile>) {
+        clearCaches()
+        updateHighlighting(files)
+    }
+
+    private fun clearCaches() {
         this::allSdks.clearValue()
         this::allNonIndexedSdks.clearValue()
 
@@ -143,7 +149,6 @@ class ScriptsCompilationConfigurationCache(private val project: Project) {
                 .single()
 
         kotlinScriptDependenciesClassFinder.clearCache()
-        updateHighlighting(files)
     }
 
     private fun updateHighlighting(files: List<VirtualFile>) {