[1/2] wineconsole: Calculate the maximum possible console window size

[Vincent Povirk]

+    c.X = (workarea.right / cell_width) - 4;
+    c.Y = (workarea.bottom / cell_height) - 3;
I think you probably want the size of the workarea (right-left,
bottom-top), not the position of the workarea's lower-right corner.