Prevent dropping a drag from TaskbarAllApps in Overview

* Don't close TaskbarAllApps once drag starts
(see comment in code regarding needing multiple shared drag
layers)
* Hide app menu split options for taskbar in overview
* One TODO is that the animation needs to be tweaked
because the scale of the icon when it's returned is too large.
* I think maybe we have to change the
TaskbarDragController#mDragIconSize since that gets directly
set from a resource. Unclear.

Test: Dragged in TaskbarAllApps in overivew and in split
select, app returned to original position and not taskbar
Bug: 251747761

Change-Id: I785f34b0bdb0b0abfc440450494074f8dfe7c31a

quickstep/src/com/android/launcher3/taskbar/allapps/TaskbarAllAppsController.java

@@ -48,6 +48,8 @@ public final class TaskbarAllAppsController {
     private AppInfo[] mApps;
     private int mAppsModelFlags;
     private List<ItemInfo> mPredictedApps;
+    private boolean mDisallowGlobalDrag;
+    private boolean mDisallowLongClick;
 
     /** Initialize the controller. */
     public void init(TaskbarControllers controllers, boolean allAppsVisible) {
@@ -78,6 +80,14 @@ public final class TaskbarAllAppsController {
         }
     }
 
+    public void setDisallowGlobalDrag(boolean disableDragForOverviewState) {
+        mDisallowGlobalDrag = disableDragForOverviewState;
+    }
+
+    public void setDisallowLongClick(boolean disallowLongClick) {
+        mDisallowLongClick = disallowLongClick;
+    }
+
     /** Updates the current predictions. */
     public void setPredictedApps(List<ItemInfo> predictedApps) {
         if (!FeatureFlags.ENABLE_ALL_APPS_IN_TASKBAR.get()) {
@@ -123,6 +133,12 @@ public final class TaskbarAllAppsController {
         mAppsView.getFloatingHeaderView()
                 .findFixedRowByType(PredictionRowView.class)
                 .setPredictedApps(mPredictedApps);
+        // 1 alternative that would be more work:
+        // Create a shared drag layer between taskbar and taskbarAllApps so that when dragging
+        // starts and taskbarAllApps can close, but the drag layer that the view is being dragged in
+        // doesn't also close
+        overlayContext.getDragController().setDisallowGlobalDrag(mDisallowGlobalDrag);
+        overlayContext.getDragController().setDisallowLongClick(mDisallowLongClick);
     }