Revert "Replace region intersection change from quickReject to use Region#op"

This reverts commit bff5c972ac.

Reason for revert: b/243640603

Change-Id: I5d25426ca0f777c8f4f2b86a6e81080dd05d4af1

services/core/java/com/android/server/wm/AccessibilityController.java

@@ -1655,8 +1655,7 @@ final class AccessibilityController {
             }
 
             // If the window is completely covered by other windows - ignore.
-            Region intersectionWindow = mTempRegion1;
-            if (!intersectionWindow.op(unaccountedSpace, regionInScreen, Region.Op.INTERSECT)) {
+            if (unaccountedSpace.quickReject(regionInScreen)) {
                 return false;
             }