Sfinv: Add 'position[]' parameter to theming

[paramat]

Allows a sfinv formspec to be positioned. Useful for skin mods to allow seeing the player using F7 while selecting skins.
@rubenwardy

[rubenwardy]

I think this is an engine bug. It shouldn't matter where you specify position really.

[paramat]

I tried placing it just before 'size[]' as that seemed to make more sense but it didn't work.
'position' seems to be something that belongs alongside 'size' in the theming parameters, it isn't intuitive anywhere else.

[rubenwardy]

'position' seems to be something that belongs alongside 'size' in the theming parameters, it isn't intuitive anywhere else.

Size is there as all formspecs have a size. Position is just a control for where the formspec is - under that logic, background with auto clipping should also be a parameter as just like position it only works once. I'd prefer for position to be allowed anywhere, and the last one be the one to take effect, as it requires less specific code in sfinv. I believe position was added this dev cycle anyway. However, I'm not strongly opposed to this PR.

[paramat]

That makes sense, closing. reopening issue minetest/minetest#6538