[CD Taskbar] Fix - Make Taskbar Icons Launch

The base TaskbarUIController returns null for recents view.This makes icons on external display's taskbar unable to launch on external displays.

Test: m
Bug: 395954042
Flag: com.android.window.flags.enable_taskbar_connected_displays
Change-Id: I389a0fa102f63ab93b8a29de722cce0a446a2ea1

quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java

@@ -77,6 +77,7 @@ import android.view.WindowInsets;
 import android.view.WindowManager;
 import android.widget.FrameLayout;
 import android.widget.Toast;
+import android.window.DesktopExperienceFlags;
 import android.window.DesktopModeFlags;
 import android.window.RemoteTransition;
 
@@ -1558,7 +1559,10 @@ public class TaskbarActivityContext extends BaseTaskbarContext {
      */
     private void launchFromInAppTaskbar(@Nullable RecentsView recents,
             @Nullable View launchingIconView, List<? extends ItemInfo> itemInfos) {
-        if (recents == null) {
+        boolean launchedFromExternalDisplay =
+                DesktopExperienceFlags.ENABLE_TASKBAR_CONNECTED_DISPLAYS.isTrue()
+                        && !mIsPrimaryDisplay;
+        if (recents == null && !launchedFromExternalDisplay) {
             return;
         }