Disable pinning popup when transient taskbar is disabled

On freeform displays where taskbar is always pinned, toggling "Always
show taskbar" option is no-op, as the taskbar won't transition to
transient taskbar.
Left a TODO to reevaluate behavior once desktop taskbar transient
behavior gets updated.

Bug: 390665752
Flag: com.android.window.flags.enable_desktop_taskbar_on_freeform_displays
Test: Manual.

Change-Id: Icfe7cd26e77de48ab34bfe4932bfedfe21923ef1

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

@@ -266,6 +266,9 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
 
         mTaskbarView.init(TaskbarViewCallbacksFactory.newInstance(mActivity).create(
                 mActivity, mControllers, mTaskbarView));
+        // Pinning popup feature availability depends on taskbar controllers, wait for the
+        // controllers state initialization before evaluating the feature.
+        mControllers.runAfterInit(mTaskbarView::updatePinningPopupEventHandlers);
         mTaskbarView.getLayoutParams().height = mActivity.isPhoneMode()
                 ? mActivity.getResources().getDimensionPixelSize(R.dimen.taskbar_phone_size)
                 : mActivity.getDeviceProfile().taskbarHeight;
@@ -302,6 +305,14 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
         }
     }
 
+    /**
+     * Called whenever a new ui controller is set.
+     */
+    public void onUiControllerChanged() {
+        // Pinning availability may depend on UI state when home has "locked" pinned taskbar.
+        mTaskbarView.updatePinningPopupEventHandlers();
+    }
+
     /** Adjusts start aligned taskbar layout accordingly to the bubble bar position. */
     @Override
     public void onBubbleBarLocationUpdated(BubbleBarLocation location) {