Adding a flag (enabled by default) to remove the all-apps button.

All apps can still be opened by clicking the caret.

Bug: 29398447
Change-Id: I61f1b05cea83a0a49d7cc16c518c5419618ba779

src/com/android/launcher3/Workspace.java

@@ -2509,9 +2509,9 @@ public class Workspace extends PagedView
                 // Don't show the message if we are dropping on the AllApps button and the hotseat
                 // is full
                 boolean isHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
-                if (mTargetCell != null && isHotseat) {
+                if (mTargetCell != null && isHotseat && !FeatureFlags.NO_ALL_APPS_ICON) {
                     Hotseat hotseat = mLauncher.getHotseat();
-                    if (hotseat.isAllAppsButtonRank(
+                    if (mLauncher.getDeviceProfile().inv.isAllAppsButtonRank(
                             hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]))) {
                         return false;
                     }