MapEditor: Align Horizontally and then vertically makes line disappear

[lefterav]

If one selects one metro line, and then aligns the line first horizontally and then vertically, or vice versa, the line disappears.

[sebkur]

Well it's kind of what is expected to happen in that case isn't it? I think what would be very helpful (also in general) is an "undo" functionality. When a user selects the wrong option, or both in sequence and ends up in a messy situation, being able to go backwards in file versions is a very standard thing to try to do.