Assertion failed (data == sub->parent) in subsurface_handle_parent_destroy (Firefox on native Wayland backend)
This assertion has failed when selecting a file in an upload dialog (which is actually the GTK native dialog) in Firefox nightly running on Wayland natively with GL compositing on.
Firefox uses subsurfaces a lot — the whole window content is an EGL subsurface, various popovers are subsurfaces too. I don't know how the GTK native dialog could've caused anything to go wrong with subsurfaces though..
(don't have a core dump because seems like AddressSanitizer disables them by default.. I'll see if I can get more details about this error later)