DO NOT MERGE Only set the LAYOUT flags if the window is fullscreen

This addresses an issue where toasts will be hidden due to the setting
of the LAYOUT_HIDE_NAVIGATION flag.

Bug: 148180738
Test: manual (adb shell settings put global policy_control "immersive.navigation=*" then try to show a toast with gravity top)
Change-Id: Ic47edc5423c4daf373fc3a8bfc30af15cadd6d90

Author: Heemin Seog

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

@@ -67,15 +67,19 @@ static int getSystemUiVisibility(WindowState win, LayoutParams attrs) {
                 : (attrs.systemUiVisibility | attrs.subtreeSystemUiVisibility);
         if (sImmersiveStatusFilter != null && sImmersiveStatusFilter.matches(attrs)) {
             vis |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-                    | View.SYSTEM_UI_FLAG_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+                    | View.SYSTEM_UI_FLAG_FULLSCREEN;
+            if (attrs.isFullscreen()) {
+                vis |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+            }
             vis &= ~(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                     | View.STATUS_BAR_TRANSLUCENT);
         }
         if (sImmersiveNavigationFilter != null && sImmersiveNavigationFilter.matches(attrs)) {
             vis |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
-                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                     | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+            if (attrs.isFullscreen()) {
+                vis |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
+            }
             vis &= ~(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                     | View.NAVIGATION_BAR_TRANSLUCENT);
         }