RDCT-1149 '+' are disapearing on hover

Make sure focus events are dispatched, and painting is done with controller's client id in RD setup.
Focus events are explicitly dispatched with controller's client id, as it doesn't seem possible to propagate client id via 'requestFocus' requests and such without introducing a dedicated JBR API.
As for the painting events, we just make them covered with the existing logic of client id propagation for InvocationEvent-s.

GitOrigin-RevId: 52d59e0ffef69dfa4dff7618a8e50551b2a26549

platform/core-api/src/com/intellij/openapi/client/ClientSessionsManager.kt

@@ -33,7 +33,7 @@ open class ClientSessionsManager<T : ClientSession> {
      */
     @JvmStatic
     fun getAppSessions(kind: ClientKind): List<ClientAppSession> {
-      return ApplicationManager.getApplication().service<ClientSessionsManager<ClientAppSession>>().getSessions(kind)
+      return ApplicationManager.getApplication()?.service<ClientSessionsManager<ClientAppSession>>()?.getSessions(kind) ?: emptyList()
     }
 
     /**

platform/platform-api/src/com/intellij/util/ui/Animator.kt

@@ -1,6 +1,7 @@
 // Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.util.ui
 
+import com.intellij.codeWithMe.ClientId
 import com.intellij.openapi.Disposable
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.EDT
@@ -24,7 +25,7 @@ abstract class Animator @JvmOverloads constructor(private val name: @NonNls Stri
   private var startTime: Long = 0
   private var startDeltaTime: Long = 0
   private var initialStep = false
-  private val coroutineScope = coroutineScope ?: CoroutineScope(SupervisorJob() + Dispatchers.Default)
+  private val coroutineScope = coroutineScope ?: CoroutineScope(SupervisorJob() + Dispatchers.Default + ClientId.coroutineContext())
 
   @Obsolete
   fun isForward(): Boolean = isForward

platform/platform-impl/src/com/intellij/ide/IdeEventQueue.kt

@@ -346,6 +346,7 @@ class IdeEventQueue private constructor() : EventQueue() {
       val runnable = InvocationUtil.extractRunnable(event)
       val runnableClass = runnable?.javaClass ?: Runnable::class.java
       val processEventRunnable = Runnable {
+        withAttachedClientId(event).use {
           val progressManager = ProgressManager.getInstanceOrNull()
           try {
             runCustomProcessors(finalEvent, preProcessors)
@@ -384,13 +385,13 @@ class IdeEventQueue private constructor() : EventQueue() {
             onFocusEvent(finalEvent)
           }
         }
+      }
 
       if (runnableClass == InvocationUtil.REPAINT_PROCESSING_CLASS) {
         processEventRunnable.run()
         return
       }
 
-      withAttachedClientId(event).use {
       if (defaultEventWithWrite) {
         ApplicationManagerEx.getApplicationEx().runIntendedWriteActionOnCurrentThread(processEventRunnable)
       }
@@ -398,7 +399,6 @@ class IdeEventQueue private constructor() : EventQueue() {
         processEventRunnable.run()
       }
     }
-    }
     finally {
       Thread.interrupted()
       processIdleActivityListeners(e)

platform/platform-impl/src/com/intellij/ide/IdeKeyboardFocusManager.kt

@@ -1,12 +1,18 @@
 // Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.ide
 
+import com.intellij.codeWithMe.ClientId.Companion.withClientId
 import com.intellij.ide.ui.ShowingContainer
+import com.intellij.openapi.application.AccessToken
+import com.intellij.openapi.client.ClientKind
+import com.intellij.openapi.client.ClientSessionsManager
 import com.intellij.openapi.diagnostic.logger
 import java.awt.*
+import java.awt.event.FocusEvent
 import java.awt.event.HierarchyEvent
 import java.awt.event.HierarchyEvent.DISPLAYABILITY_CHANGED
 import java.awt.event.HierarchyEvent.SHOWING_CHANGED
+import java.awt.event.WindowEvent
 import java.lang.invoke.MethodHandles
 import java.lang.invoke.MethodType
 import javax.swing.DefaultFocusManager
@@ -34,16 +40,30 @@ internal class IdeKeyboardFocusManager : DefaultFocusManager() /* see javadoc ab
       e.component.dispatchEvent(patchedEvent)
       return true
     }
+    val dispatch = { getAssociatedClientId(e).use { super.dispatchEvent(e) } }
     if (EventQueue.isDispatchThread()) {
       var result = false
-      performActivity(e) { result = super.dispatchEvent(e) }
+      performActivity(e) { result = dispatch() }
       return result
     }
     else {
-      return super.dispatchEvent(e)
+      return dispatch()
     }
   }
 
+  private fun getAssociatedClientId(e: AWTEvent) : AccessToken {
+    val id = e.id
+    if (id == WindowEvent.WINDOW_GAINED_FOCUS ||
+        id == WindowEvent.WINDOW_LOST_FOCUS ||
+        id == FocusEvent.FOCUS_GAINED ||
+        id == FocusEvent.FOCUS_LOST) {
+      ClientSessionsManager.getAppSessions(ClientKind.CONTROLLER).firstOrNull()?.let {
+        return withClientId(it.clientId)
+      }
+    }
+    return AccessToken.EMPTY_ACCESS_TOKEN
+  }
+
   override fun setDefaultFocusTraversalPolicy(defaultPolicy: FocusTraversalPolicy) {
     if (parentConstructorExecuted) {
       val log = logger<IdeKeyboardFocusManager>()