Don't let hidden keyguard interfere with button and screen brightness overrides

Change-Id: Ibdc115b8fb6900b0f859085c13a707750deeab57
BUG: 2252317

Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/services/java/com/android/server/WindowManagerService.java b/services/java/com/android/server/WindowManagerService.java
index f5d3e8e..34a7fc0 100644
--- a/services/java/com/android/server/WindowManagerService.java
+++ b/services/java/com/android/server/WindowManagerService.java
@@ -10267,9 +10267,10 @@
                                 && buttonBrightness < 0) {
                             buttonBrightness = w.mAttrs.buttonBrightness;
                         }
-                        if (attrs.type == WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG
-                                || attrs.type == WindowManager.LayoutParams.TYPE_KEYGUARD
-                                || attrs.type == WindowManager.LayoutParams.TYPE_SYSTEM_ERROR) {
+                        if (canBeSeen
+                                && (attrs.type == WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG
+                                 || attrs.type == WindowManager.LayoutParams.TYPE_KEYGUARD
+                                 || attrs.type == WindowManager.LayoutParams.TYPE_SYSTEM_ERROR)) {
                             syswin = true;
                         }
                     }