Read system decor support status from WM

There is no way to add FLAG_SHOULD_SHOW_SYSTEM_DECORATIONS to
hardware or simulated displays, so wallpaper, IME and nav bar were
not showing up even when desktop mode developer option was enabled.

Bug: 123199549
Bug: 125007644
Bug: 124073468
Bug: 124073384
Test: Enable force desktop mode, reboot, create simulated display
Change-Id: Id6f2f3746407467f20c1f26e735b84653e34625d

1 files changed, 9 insertions, 0 deletions

diff --git a/core/java/android/view/WindowManagerImpl.java b/core/java/android/view/WindowManagerImpl.java
index a102f6c8a74d..2e4db5c4eef9 100644
--- a/core/java/android/view/WindowManagerImpl.java
+++ b/core/java/android/view/WindowManagerImpl.java
@@ -177,6 +177,15 @@ public final class WindowManagerImpl implements WindowManager {
     }
 
     @Override
+    public boolean shouldShowSystemDecors(int displayId) {
+        try {
+            return WindowManagerGlobal.getWindowManagerService().shouldShowSystemDecors(displayId);
+        } catch (RemoteException e) {
+        }
+        return false;
+    }
+
+    @Override
     public void setShouldShowIme(int displayId, boolean shouldShow) {
         try {
             WindowManagerGlobal.getWindowManagerService().setShouldShowIme(displayId, shouldShow);