Fixing broken accessibility drag

> Allow touch events on hotseat while in accessible drag as drag now
happens in spring loaded state.
> Allow drop target buttons to ignore thershold check when in
accessibility drag

Bug: 30900444
Change-Id: I88274367983fc027b2ddde3a719ca943f4f48587
diff --git a/src/com/android/launcher3/Hotseat.java b/src/com/android/launcher3/Hotseat.java
index 6605654..ceaedef 100644
--- a/src/com/android/launcher3/Hotseat.java
+++ b/src/com/android/launcher3/Hotseat.java
@@ -162,11 +162,9 @@
     @Override
     public boolean onInterceptTouchEvent(MotionEvent ev) {
         // We don't want any clicks to go through to the hotseat unless the workspace is in
-        // the normal state.
-        if (mLauncher.getWorkspace().workspaceInModalState()) {
-            return true;
-        }
-        return false;
+        // the normal state or an accessible drag is in progress.
+        return mLauncher.getWorkspace().workspaceInModalState() &&
+                !mLauncher.getAccessibilityDelegate().isInAccessibleDrag();
     }
 
     @Override