Not touchable windows should not hide windows behind

When computing which windows to report for accessibility we were not
reporting windows behind non touchable ones. However, if a window is
not-touchable the touch events go to the window behind it. Hence, a
not-touchable window should not affect the reproted windows for
accessibility.

Change-Id: I213a32b33b0986a73d8bbdf0a3e40e6ca6e4261b
diff --git a/services/core/java/com/android/server/wm/AccessibilityController.java b/services/core/java/com/android/server/wm/AccessibilityController.java
index 6cb6b76..d05d0c7 100644
--- a/services/core/java/com/android/server/wm/AccessibilityController.java
+++ b/services/core/java/com/android/server/wm/AccessibilityController.java
@@ -961,8 +961,6 @@
                     // If the window is not touchable, do not report it but take into account
                     // the space it takes since the content behind it cannot be touched.
                     if ((flags & WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE) != 0) {
-                        unaccountedSpace.op(boundsInScreen, unaccountedSpace,
-                                Region.Op.DIFFERENCE);
                         continue;
                     }