input/cursor: correctly send tablet v2 up event when over non-v2 surface #5237
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If we started holding the tool tip down on a surface that accepts tablet
v2, we should notify that surface if it gets released over a surface
that doesn't support v2.
Since GTK supports tablet v2, this fixes the common case of starting a
drag over a GTK surface (e.g. scrollbar) and releasing it outside (e.g.
over the gaps between sway containers, or in a terminal).
It does not fix the other direction, e.g. dragging over a non-v2 surface
(with tablet events being emulated as mouse events) and releasing over
a v2 surface.
Refs #5230.