best description is by replication: (pardon my terminology)
1) navigate somewhere in map, zoom out to last detailed level (before going schematic)
2) hold any building by hand (medium pole in example)
3) mouse over any (other) building (lab in example)
4) zoom out one more level, keeping cursor on the building
5) gui on the side appears for the built building, with preview of the held building (see pic)
AND does not disappear on Clear Cursor (´q´) (unlike on normal zoomout), only on zoom-in back or quit map.
tested: if only holding building OR only hovering over built building, the gui disappears.
appears on any combination of built structures and trees. (does not happen with such items as repair pack, landfill, concrete, ammo)
[0.18.0] GUI - sticky detail swap on zoomout
Re: [0.18.0] GUI - sticky detail swap on zoomout
Looks like the same as this, which I can't reproduce in 1.1:
viewtopic.php?f=11&t=83243
viewtopic.php?f=11&t=83243