Fix minor issue with IME

Because we only "carve" out the area for the IME once it's actually
visible now, we need to relayout the windows when we show it - else
they won't update the insets until the next real layout happens.

Bug: 28175599
Change-Id: Ie0af1225da03905bfcb52044e212812c892c88a9

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

@@ -1774,6 +1774,10 @@ class WindowStateAnimator {
         }
         if (mWin.mAttrs.type == TYPE_INPUT_METHOD) {
             mService.adjustForImeIfNeeded(mWin.mDisplayContent);
+            if (isEntrance) {
+                mWin.setDisplayLayoutNeeded();
+                mService.mWindowPlacerLocked.requestTraversal();
+            }
         }
         return mAnimation != null;
     }