Fixing crash upon cancellation of an accessible drag.

This fixes perhaps an old bug.

If we started an accessible drag for an only item on a page,
then uninstalled the app while dragging, the page was removed
without unsetting its accessibility delegate. Later, the system asks
the delegate to do something, but the drag is over, and some pointers
are null, so everything crashes.

Fixing this.

Bug: 22028725
Change-Id: I85adcd42ae896603634994e20a7790792f7e84b1
(cherry picked from commit de1e67c38856ab1253426bfb4f892895eeb5f6d9)
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index e83ef7c..08e6429 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -887,6 +887,9 @@
             }
         }
 
+        LauncherAccessibilityDelegate delegate =
+                LauncherAppState.getInstance().getAccessibilityDelegate();
+
         // We enforce at least one page to add new items to. In the case that we remove the last
         // such screen, we convert the last screen to the empty screen
         int minScreens = 1 + numCustomPages();
@@ -901,6 +904,11 @@
                 if (indexOfChild(cl) < currentPage) {
                     pageShift++;
                 }
+
+                if (delegate != null && delegate.isInAccessibleDrag()) {
+                    cl.enableAccessibleDrag(false, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
+                }
+
                 removeView(cl);
             } else {
                 // if this is the last non-custom content screen, convert it to the empty screen