Allow long-press on workspace immediately after dropping.

Previously the touch was consumed until the transition from
spring-loaded to normal workspace finished, leading long
presses to trigger on the background rather than on apps.
This made it difficult to move multiple icons consecutively.

Bug: 29631912
Change-Id: I259e618c81f56bc40d08a5d63ddbbf3c82a76baf

src/com/android/launcher3/Workspace.java

@@ -1160,7 +1160,7 @@ public class Workspace extends PagedView
     }
 
     private boolean shouldConsumeTouch(View v) {
-        return (workspaceInModalState() || !isFinishedSwitchingState())
+        return !workspaceIconsCanBeDragged()
                 || (!workspaceInModalState() && indexOfChild(v) != mCurrentPage);
     }
 
@@ -1826,6 +1826,11 @@ public class Workspace extends PagedView
         return mState != State.NORMAL;
     }
 
+    /** Returns whether a drag should be allowed to be started from the current workspace state. */
+    public boolean workspaceIconsCanBeDragged() {
+        return mState == State.NORMAL || mState == State.SPRING_LOADED;
+    }
+
     @Thunk void updateChildrenLayersEnabled(boolean force) {
         boolean small = mState == State.OVERVIEW || mIsSwitchingState;
         boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageInTransition();