Disable InkWindow default animation

By default all PhoneWindows use Theme_windowAnimationStyle which
animates window up and down when gaining and losing focus respectively.
For InkWindow we don't need any animation.

Fix: 237331144
Fix: 245441579
Bug: 253477462

Test: atest StylusHandwritingTest
Change-Id: I209b03dfbed386a2863921b49d43858037d380b8

core/java/android/inputmethodservice/InkWindow.java

@@ -53,6 +53,9 @@ final class InkWindow extends PhoneWindow {
         final LayoutParams attrs = getAttributes();
         attrs.layoutInDisplayCutoutMode = LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
         attrs.setFitInsetsTypes(0);
+        // disable window animations.
+        // TODO(b/253477462): replace with API when available
+        attrs.windowAnimations = -1;
         // TODO(b/210039666): use INPUT_FEATURE_NO_INPUT_CHANNEL once b/216179339 is fixed.
         setAttributes(attrs);
         // Ink window is not touchable with finger.