Crash on device (Pixel 9 Pro, Android 17) when swiping the app away
from recents:
JNI DETECTED ERROR: java_object == null in call to GetObjectClass
#06 libgio.so (registerFragment+104)
Root cause: Gio's window.detach sends an EMPTY AndroidViewEvent
(View == 0) as its detach signal (os_android.go: window.detach ->
processEvent(AndroidViewEvent{})), which fires when the GioView is
destroyed — i.e. the activity going away on a recents-wipe. Our
handleEvent passed that null ref straight into registerFragment,
whose GetObjectClass(null) aborts. Pre-existing latent bug; the
emulator never delivered a detach event in testing (home keeps the
view attached, force-stop kills before the event dispatches).
Guard on both sides: handleEvent ignores the View == 0 detach
signal (a re-attach arrives as a fresh event with a live view), and
registerFragment returns early on a null view as defense in depth.
Verified on the crashing device: recents swipe now closes the app
cleanly, crash buffer empty.
Greg Pomerantz
fdbffc9f5c