Popups appear offcenter when even width buildings are mirrored

This has already been a bug for at least two years.

What's happening:
When even width buildings are mirrored, their popups appear exactly one tile to the right of where they are in the default rotation. This behavior can be seen on sieves and transformers, but probably applies to every building that meets these criteria.

Speculated reason:
This probably happens because popup coordinates are offset from so-called tile of interest by specific delta, which doesn't get inverted when the building is mirrored while the tile of interest does. As such:

Solution 1: Don't invert tile of interest. This by far seems the most logical to me. While it doesn't tackle this problem specifically, it does get rid of other unwelcome jank, such as building moving a tile to the left when you mirror it.

Solution 2: Add exceptions for this specific case to invert the sign.