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server: add wl_global_set_user_data

Simon Ser requested to merge emersion/wayland:global-set-user-data into master

When implementing a workaround for 1, one needs to accept a global to be bound even though it has become stale.

Often, a global's user data is free'd when the global needs to be destroyed. Being able to set the global's user data (e.g. to NULL) can help preventing a use-after-free.

(The alternative is to make the compositor responsible for keeping track of stale user data objects via e.g. refcounting.)

Signed-off-by: Simon Ser contact@emersion.fr

Edited by Simon Ser

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