macOS: fix crosshair verticalText and contextMenu pointerStyles

[monsterkodi]

fixes three mouse pointer styles that weren't working on macOS.

[mitchellh]

Hm, modifying this in the back port isn't exactly right because back port is only supposed to match the real version directly. We may have to introduce a non-backport structure/view helper to add our pointer style.

Sorry to make this complicated, but the way it's implemented now if we ever dropped support for macOS versions that don't support pointerStyle then we'd get breakage.

[monsterkodi]

unfortunately, i don't understand what you are saying :)
are you talking about the contextMenu style being implemented differently?
if yes, we could just remove the fix for the contextMenustyle and still get the other two styles working?

[monsterkodi]

i honestly tried to understand the problem, but i couldn't figure it out :(

since i don't want to spoil your PR list (and my mind with this unfinished business ;) i will close it. i am sure someone more capable than me will be able to solve this properly at some point or you will find the time to do it yourself.