Only Dispatch Stylus Key Events to System UI on Key Down

Test: manual

Fixes: b/254604589
Change-Id: Iaa82292f289f51f84d6b01ce4cb7a69fabd8dd4e

services/core/java/com/android/server/policy/PhoneWindowManager.java

@@ -4316,7 +4316,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
             case KeyEvent.KEYCODE_STYLUS_BUTTON_SECONDARY:
             case KeyEvent.KEYCODE_STYLUS_BUTTON_TERTIARY:
             case KeyEvent.KEYCODE_STYLUS_BUTTON_TAIL: {
-                if (!mStylusButtonsDisabled) {
+                if (down && !mStylusButtonsDisabled) {
                     sendSystemKeyToStatusBarAsync(keyCode);
                 }
                 result &= ~ACTION_PASS_TO_USER;