[0.12.19]Filtered inventory slots don't highlight

[pyrolytic_tungsten]

When you put your mouse cursor over an unfiltered inventory slot (toolbar, cargo wagon, etc...) it will highlight by lightening the background of the slot and drawing a white box around the slot. Nothing currently happens when mousing over a filtered inventory slot. To be consistent I would expect that when the mouse cursor is placed over a filtered item slot it will highlight by lightening the background of the slot and drawing a blue or white box around the slot.

[posila]

Thanks for the report. Fixed in 0.12.20