feat: add BELTCOLUMN{1,2,3,4} keywords

[segnis-de-pugis]

Would it be possible to have something like this in pd2?

I would like be able to hide potions on the ground if my belt is already full and only show them when there is a space for them in the designated column(s) of the belt. For example BELTCOLUMN2>0 would match if there is at least one item in the second column in the belt.

It's probably a niche use-case, but I'd personally use it in my filter.

Examples

Alias[HEALTH_POTS]: (hp1 OR hp2 OR hp3 OR hp4 OR hp5)
Alias[MANA_POTS]: (mp1 OR mp2 OR mp3 OR mp4 OR mp5)

% hide potions if the belt is full
ItemDisplay[(BELTCOLUMN1>3 BELTCOLUMN2>3) HEALTH_POTS]: %RED%would be hidden %WHITE%%NAME%
ItemDisplay[BELTCOLUMN3>3 MANA_POTS]: %RED%would be hidden %WHITE%%NAME%

% show potions if there is space in the belt (only works for belts with 4 rows)
ItemDisplay[(BELTCOLUMN1<4 OR BELTCOLUMN2<4) HEALTH_POTS): %GREEN%would be shown %WHITE%%NAME%
ItemDisplay[BELTCOLUMN3><4 MANA_POTS]: %GREEN%would be shown %WHITE%%NAME%

Space for mana pots:

Space for health pots:

No space for any pots:

Tests

I tested that this works with no belt, 2x4 belt, 4x4 belt

Known limitations

Because of the caching, hidden potions won't become visible when the character drinks a potion from the belt, and vice-versa.