Don't highlight gradle scripts during gradle import.

Show warning on the top panel for these files

idea/idea-gradle/src/org/jetbrains/kotlin/idea/core/script/GradleScriptTemplateProvider.kt

@@ -236,6 +236,9 @@ class GradleScriptDefinitionsContributor(private val project: Project) : ScriptD
 
     private class ErrorScriptDependenciesResolver(private val message: String? = null) : DependenciesResolver {
         override fun resolve(scriptContents: ScriptContents, environment: Environment): ResolveResult {
+            if (ReloadGradleTemplatesOnSync.gradleState.isSyncInProgress) {
+                return ResolveResult.Failure(ScriptReport("Highlighting is impossible during Gradle Import", ScriptReport.Severity.WARNING))
+            }
             return ResolveResult.Failure(
                 ScriptReport(
                     message ?: "Failed to load script definitions by ${GradleScriptDefinitionsContributor::class.java.name}"
@@ -245,10 +248,25 @@ class GradleScriptDefinitionsContributor(private val project: Project) : ScriptD
     }
 }
 
+internal class GradleSyncState {
+    var isSyncInProgress: Boolean = false
+}
+
 class ReloadGradleTemplatesOnSync : ExternalSystemTaskNotificationListenerAdapter() {
+    companion object {
+        internal val gradleState = GradleSyncState()
+    }
+
+    override fun onStart(id: ExternalSystemTaskId, workingDir: String?) {
+        if (id.type == ExternalSystemTaskType.RESOLVE_PROJECT && id.projectSystemId == GRADLE_SYSTEM_ID) {
+            gradleState.isSyncInProgress = true
+        }
+    }
 
     override fun onEnd(id: ExternalSystemTaskId) {
         if (id.type == ExternalSystemTaskType.RESOLVE_PROJECT && id.projectSystemId == GRADLE_SYSTEM_ID) {
+            gradleState.isSyncInProgress = false
+
             val project = id.findProject() ?: return
             val gradleDefinitionsContributor = ScriptDefinitionContributor.find<GradleScriptDefinitionsContributor>(project)
             gradleDefinitionsContributor?.reloadIfNeccessary()