[PATCH 0/3] Several fixes for drag 'n' drop corner cases

[Ander Conselvan de Oliveira]

Hi,

This series includes several bug fixes for drag and drop corner cases.
A lot can go wrong if the client dies or one of the surfaces used is
destroyed during the grab and we were not checking those cases properly.

The first three patches are for libwayland-server and the others for
weston.

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1.7.4.1