wayland-compositor: Clamp to 1, 1 on drag resize
wayland-compositor: Clamp to 1, 1 on drag resize

Summary:
Apparently negative values mean "pick a size", though this is
undocumented.

Reviewers: devilhorns, zmike

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2191

tasn/enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,FlorentRevest/Enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e