Silly me ;-(
So the easy thing that I should have done already is to grep for all instances where the tooltip dimensions are set.
This of course reveals something interesting:
Code:
$ find . -name "*.lua"| xargs egrep "ItemTooltip\:Set[DS]"
./afxSettings/afxSettings.lua: ItemTooltip:SetDimensionConstraints(600, 0, 600, 1080)
./afxSettings/afxSettings.lua: ItemTooltip:SetScale(0.875)
./afxSettings/afxSettings.lua: ItemTooltip:SetScale(0.875)
./afxSettings/afxSettings.lua:ItemTooltip:SetDimensionConstraints(600, 0, 600, 1080)
./afxSettings/afxSettings.lua:ItemTooltip:SetScale(0.875)
./afxSettings/afxSettings.lua:ItemTooltip:SetScale(0.875)
./FCOChangeStuff/src/FCOCS_tooltips.lua: ItemTooltip:SetDimensionConstraints(532, 0, 532, 1440)
./FCOChangeStuff/src/FCOCS_tooltips.lua: ItemTooltip:SetDimensionConstraints(itemBorderSize, 0, itemBorderSize, heightMax)
./FCOChangeStuff/src/FCOCS_tooltips.lua: ItemTooltip:SetScale(itemScale)
So FCO Changestuff had the needed settings already, and I just did not think of checking there.
Me stupid.
Sorry for wasting all your time.
afx