Scripts: clear manual configuration loading state after project import

^KT-35268

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

@@ -175,6 +175,12 @@ interface ScriptConfigurationManager {
             (getInstance(project) as AbstractScriptConfigurationManager).clearCaches()
         }
 
+        fun clearManualConfigurationLoadingIfNeeded(file: VirtualFile) {
+            if (file.LOAD_CONFIGURATION_MANUALLY == true) {
+                file.LOAD_CONFIGURATION_MANUALLY = null
+            }
+        }
+
         fun markFileWithManualConfigurationLoading(file: VirtualFile) {
             file.LOAD_CONFIGURATION_MANUALLY = true
         }

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/GradleScriptConfigurationLoader.kt

@@ -69,6 +69,8 @@ class GradleScriptConfigurationLoader(project: Project) : DefaultScriptConfigura
             return true
         }
 
+        ScriptConfigurationManager.clearManualConfigurationLoadingIfNeeded(vFile)
+
         // Gradle read files from FS
         GlobalScope.launch(EDT(project)) {
             runWriteAction {