SlowOperations from tool window

[YannCebron]

running master, 221-SNAPSHOT

java.lang.Throwable: Slow operations are prohibited on EDT. See SlowOperations.assertSlowOperationsAreAllowed javadoc.
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:182)
	at com.intellij.util.SlowOperations.assertSlowOperationsAreAllowed(SlowOperations.java:102)
	at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:784)
	at com.intellij.psi.stubs.StubIndexImpl.getContainingIds(StubIndexImpl.java:521)
	at com.intellij.psi.stubs.StubIndexImpl.processElements(StubIndexImpl.java:317)
	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:101)
	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:89)
	at org.jetbrains.kotlin.idea.stubindex.KotlinFileFacadeClassByPackageIndex.get(KotlinFileFacadeClassByPackageIndex.kt:16)
	at org.jetbrains.kotlin.idea.caches.resolve.IDEKotlinAsJavaSupport$getFacadeClassesInPackage$facadeFilesInPackage$1.invoke(IDEKotlinAsJavaSupport.kt:65)
	at org.jetbrains.kotlin.idea.caches.resolve.IDEKotlinAsJavaSupport$getFacadeClassesInPackage$facadeFilesInPackage$1.invoke(IDEKotlinAsJavaSupport.kt:39)
	at org.jetbrains.kotlin.idea.util.application.ApplicationUtilsKt$sam$com_intellij_openapi_util_Computable$0.compute(ApplicationUtils.kt)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:867)
	at org.jetbrains.kotlin.idea.util.application.ApplicationUtilsKt.runReadAction(ApplicationUtils.kt:20)
	at org.jetbrains.kotlin.idea.caches.resolve.IDEKotlinAsJavaSupport.getFacadeClassesInPackage(IDEKotlinAsJavaSupport.kt:63)
	at org.jetbrains.kotlin.asJava.finder.JavaElementFinder.getClasses(JavaElementFinder.kt:139)
	at com.intellij.psi.impl.JavaPsiFacadeImpl.getClasses(JavaPsiFacadeImpl.java:260)
	at com.intellij.psi.impl.file.PsiPackageImpl.getClasses(PsiPackageImpl.java:142)
	at com.intellij.psi.impl.file.PsiPackageImpl.processDeclarations(PsiPackageImpl.java:320)
	at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.processPackageDeclarations(PsiJavaFileBaseImpl.java:451)
	at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.processCurrentPackage(PsiJavaFileBaseImpl.java:395)
	at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.processOnDemandPackages(PsiJavaFileBaseImpl.java:373)
	at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.processDeclarations(PsiJavaFileBaseImpl.java:301)
	at com.intellij.psi.scope.util.PsiScopesUtil.treeWalkUp(PsiScopesUtil.java:61)
	at com.intellij.psi.scope.util.PsiScopesUtil.treeWalkUp(PsiScopesUtil.java:40)
	at com.intellij.psi.scope.util.PsiScopesUtil.resolveAndWalk(PsiScopesUtil.java:207)
	at com.intellij.psi.impl.PsiImplUtil.getReferenceVariantsByFilter(PsiImplUtil.java:160)
	at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.getVariants(PsiJavaCodeReferenceElementImpl.java:883)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at idea.plugin.psiviewer.util.IntrospectionUtil.getValue(IntrospectionUtil.java:46)
	at idea.plugin.psiviewer.view.PropertySheetPanel.setTarget(PropertySheetPanel.java:57)
	at idea.plugin.psiviewer.view.PsiViewerPanel.updatePropertySheet(PsiViewerPanel.java:250)
	at idea.plugin.psiviewer.view.PsiViewerPanel.setSelectedElement(PsiViewerPanel.java:233)
	at idea.plugin.psiviewer.view.PsiViewerPanel$ViewerTreeSelectionListener.valueChanged(PsiViewerPanel.java:193)
	at java.desktop/javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:641)
	at java.desktop/javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1111)
	at java.desktop/javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:297)
	at java.desktop/javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:191)
	at java.desktop/javax.swing.JTree.setSelectionPath(JTree.java:1656)
	at java.desktop/javax.swing.plaf.basic.BasicTreeUI.selectPathForEvent(BasicTreeUI.java:2736)
	at java.desktop/javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:4016)
	at java.desktop/javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3955)
	at com.intellij.util.ui.MouseEventAdapter.mousePressed(MouseEventAdapter.java:30)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6651)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3345)
	at java.desktop/java.awt.Component.processEvent(Component.java:6419)
	at java.desktop/java.awt.Container.processEvent(Container.java:2263)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5029)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4544)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2790)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:891)
	at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:820)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:757)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:449)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:801)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:448)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:119)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:614)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:446)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:820)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:494)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)