Great detailed analysis in the backtrace! :)
What confused me at first was that the present_wnmd_flips_stop function is
called at all in this state because it should only be called when at least
one flip has been done and in this case xwl_window->present_window must
have been set to the presenting
On `ClipNotify()`, `present_clip_notify()` will possibly end up issuing
a `flips_stop()` if `check_flip()` returns `FALSE`.
`present_wnmd_check_flip()` however can return `FALSE` in a variety of
cases, before eventually checking with the driver's `check_flip2()`
which in the case of `xwl_present_c
