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c80af0c2c0
The handling of `impl::pendingRequests` is a bit problematic because,
for example, during startup, if `spa_libcamera_buffer_recycle()` observes
that `impl::active == false`, then it will try to append to `impl::pendingRequests`,
which is being iterated in the main thread in `spa_libcamera_stream_on()`.
That is not allowed on an `std::deque`.
So instead remove it altogether, and simply queue all requests when starting.
After `libcamera::Camera::stop()` returns, every request is guaranteed not
to be used by libcamera, and they can be freely reused, so this is safe to do.
This also removes the need for calling `spa_libcamera_buffer_recycle()` when
the buffers are set/unset on a port since that function no longer changes
anything apart from updating `buffer::flags` but `spa_libcamera_alloc_buffers()`
is modified appropriately to take care of that. And in the case of
`spa_libcamera_clear_buffers()` clearing the flag is not required because the
next `spa_libcamera_alloc_buffers()` call will reset reset the flags.
(cherry picked from commit
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