Display Expansion (of free42 skin) is not full width

[sbridger]

Fixed: DisplaySize needed to be exactly correct.
skin is here

(btw I would probably* like the display lines to be changeable from the menu, as my default choice is 3 lines i.e. I can see x,y when the menu is displayed, but sometimes would like it longer)

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Trying to make an existing skin work with plus42, and 3 lines. (linux)

If I don't specify DisplaySize, then it stretches the whole calculator longer.
But if I do specify it, and 3 lines, then the expanded zone appears to be the width of the pixel array only, and expands the screen area sown over the keyboard instead of making the calculator longer.

Skin: 0,0,320,460
Display: 12,18 2.25 3 caffbf 000000 
DisplaySize: 22,3 20 3 3   #has the problem described
DisplaySize: 22,2 18 3 3   #works properly.