Tests: do not throw roots change event in the current thread

This may cause exception during resolve,
because all caches are invalidated after this
and resolve should be restarted
Exception: module descriptor isn't find in its own dependencies
Unmute IdeReplCompletionTestGenerated.testDefinedExtension

^KT-34825 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/configuration/DefaultScriptingSupport.kt

@@ -14,6 +14,7 @@ import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiFile
 import com.intellij.psi.PsiManager
 import com.intellij.ui.EditorNotifications
+import com.intellij.util.ui.UIUtil
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import org.jetbrains.annotations.TestOnly
@@ -528,6 +529,8 @@ abstract class DefaultScriptingSupportBase(val manager: CompositeScriptConfigura
         manager.updater.update {
             reloadOutOfDateConfiguration(file, forceSync = true)
         }
+
+        UIUtil.dispatchAllInvocationEvents()
     }
 
     fun collectConfigurations(builder: ScriptClassRootsBuilder) {

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ucache/ScriptClassRootsUpdater.kt

@@ -234,11 +234,7 @@ abstract class ScriptClassRootsUpdater(
             }
         }
 
-        if (ApplicationManager.getApplication().isUnitTestMode) {
-            TransactionGuard.submitTransaction(project, doNotifyRootsChanged)
-        } else {
-            TransactionGuard.getInstance().submitTransactionLater(project, doNotifyRootsChanged)
-        }
+        TransactionGuard.getInstance().submitTransactionLater(project, doNotifyRootsChanged)
     }
 
     private fun updateHighlighting(project: Project, filter: (VirtualFile) -> Boolean) {