Fix issue #2267665 IME keyboard appears as Blank in compose view...

...if you re-lunch messaging application after deleting the
character and pressing home key

Change-Id: Idc7da05e54730958644e80069764237e5db6f288

services/java/com/android/server/WindowManagerService.java

@@ -2449,7 +2449,12 @@ public class WindowManagerService extends IWindowManager.Stub
             boolean assignLayers = false;
 
             if (imMayMove) {
-                if (moveInputMethodWindowsIfNeededLocked(false)) {
+                if (moveInputMethodWindowsIfNeededLocked(false) || displayed) {
+                    // Little hack here -- we -should- be able to rely on the
+                    // function to return true if the IME has moved and needs
+                    // its layer recomputed.  However, if the IME was hidden
+                    // and isn't actually moved in the list, its layer may be
+                    // out of data so we make sure to recompute it.
                     assignLayers = true;
                 }
             }