New J2K : move resolve resolve out of EDT in shorten references processing

relates to #KT-31812

idea/ide-common/src/org/jetbrains/kotlin/idea/util/ActionRunningMode.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2020 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.util
+
+import com.intellij.openapi.application.ApplicationManager
+
+enum class ActionRunningMode {
+    RUN_IN_CURRENT_THREAD,
+    RUN_IN_EDT
+}
+
+inline fun <T> ActionRunningMode.runAction(crossinline action: () -> T): T = when (this) {
+    ActionRunningMode.RUN_IN_CURRENT_THREAD -> {
+        action()
+    }
+    ActionRunningMode.RUN_IN_EDT -> {
+        var result: T? = null
+        ApplicationManager.getApplication().invokeAndWait {
+            result = ApplicationManager.getApplication().runWriteAction<T> { action() }
+        }
+        result!!
+    }
+}

idea/ide-common/src/org/jetbrains/kotlin/idea/util/ImportInsertHelper.kt

@@ -25,6 +25,7 @@ abstract class ImportInsertHelper {
     abstract fun importDescriptor(
         file: KtFile,
         descriptor: DeclarationDescriptor,
+        actionRunningMode: ActionRunningMode = ActionRunningMode.RUN_IN_CURRENT_THREAD,
         forceAllUnderImport: Boolean = false
     ): ImportDescriptorResult