Make safe double remove?

[Neil Roberts]

Jonathan Howard <jonathan at unbiased.name> writes:

> wl_list_remove changed isn't 100% guaranteed to not break anything, on
> the other hand there is no guarantee the code does not have the fatal
> double remove already.

We definitely do already have a double-remove bug in Weston as described
here:

http://lists.freedesktop.org/archives/wayland-devel/2014-January/012891.html

I think the proposed change to wl_list_remove would fix that too.

Regards,
- Neil
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