Add haptics for opening taskbar pinning popup view from anywhere

The divider's listener is implemented via `View.OnLongClickListener`,
which automatically handles haptics. While the taskbar view uses a
custom gesture detector (to get the associated event and its x/y
coordinates), which doesn't have the same logic out of the box. This CL
adds a manual call to perform haptic feedback for long press events
(this also corresponds to the implementation in a similar gesture
detector - `WorkspaceTouchListener`).

Bug: 382056013
Flag: com.android.launcher3.show_taskbar_pinning_popup_from_anywhere
Test: manual on a fold
Change-Id: I3887e0f9839a7992ccd8b6786bdf1268bfafd09e

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

@@ -25,6 +25,7 @@ import static com.android.launcher3.taskbar.TaskbarAutohideSuspendController.FLA
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.view.GestureDetector;
+import android.view.HapticFeedbackConstants;
 import android.view.InputDevice;
 import android.view.MotionEvent;
 import android.view.View;
@@ -232,15 +233,19 @@ public class TaskbarViewCallbacks {
 
         @Override
         public void onLongPress(@NonNull MotionEvent event) {
-            maybeShowPinningView(event);
+            if (maybeShowPinningView(event)) {
+                mTaskbarView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+            }
         }
 
-        private void maybeShowPinningView(@NonNull MotionEvent event) {
+        /** Returns true if the taskbar pinning popup view was shown for {@code event}. */
+        private boolean maybeShowPinningView(@NonNull MotionEvent event) {
             if (!DisplayController.isPinnedTaskbar(mActivity) || mTaskbarView.isEventOverAnyItem(
                     event)) {
-                return;
+                return false;
             }
             mControllers.taskbarPinningController.showPinningView(mTaskbarView, event.getRawX());
+            return true;
         }
     }
 }