Currently, the osc will add a margin of (osc_height / 2) to the
deadzonesize for the window controls, the topbar and the bottombar,
i.e. when osc-deadzonesize=1, the osc will show up even if the cursor
is only hovering (osc_height / 2) pixels above or below it. This is not
what this option is supposed to do according to the manual, instead
osc-deadzonesize=1 should result in the osc only appearing when it is
directly hovered. The user can simply set osc-deadzonesize=0.9 or so if
such a margin is desired, instead make the option work as advertised by
removing this margin.
It should be noted that osc-layout=box does not share this behavior,
and it already works as advertised in the manual.