Scroll speed (with secondary click) too fast

[Yona-TYT]

Linux SDL2 r10703

Secondary click scrolling on the minimap seems to be broken, it's too sensitive and doesn't seem to be accepting the value entered in the display settings.

Also it is not responding correctly to the movement of the cursor, for example if you make circular movements it will only maintain a constant vertical/horizontal movement.

[Yona-TYT]

I write to remember this.