In minimap a rectangle with one point outside the map region will be distorted

[prissi]

There seems some strong gravitational pull if you leave out flat simutrans lands in the minimap ... investigating.

[jamespetts]

SimuRelativity...?

[Dwachs]

This is a feature
The rectangle is distorted to take the height of the tiles at the corners of the viewport into account. Otherwise, the placement of the rectangle is off for high mountains.