Version of OpenTTD

4fd2eec

Expected result

Still showing a cursor when close to a border while dragging a train.

Actual result

When you drag a train close to a border, it disappears.

For the normal cursor, x=0,y=0 is the top/left part of the cursor. When dragging trains, it is not (the cursor is in the middle of the sprite). So the game tries the draw the mouse from x=-5,y=10, for example, which in result means it is not drawn at all for OpenGL.

Steps to reproduce

• Build a train
• Drag it to the edges of the screen
• On the top and/or left border, it disappears when getting close