Bug : click never works when cursor is on top of the keynav grid line

[mm40]

Steps to reproduce:

Super+space start, grid 4x3
h warp,end,start , grid 4x3
1 click 1

1. Press Super+space : the grid is 4x3 appears over entire screen.
2. Press h : now the cursor is right in the middle of the screen, over the vertical line of keynav.
3. Press 1 : there should be a click on the position where the cursor is. But, because the cursor is over the line drawn by keynav, no click happens. It's as if the cursor over keynav clicks the keynav "window" itself, rather than the actual application beneath the keynav frame.

Additional notes:

• I use 4x3 instead of 3x3, because I have my 4 fingers of the jkl; keys of the keyboard home row, and want to use all of them.

This could be the same as #35 .

And here's the fix : #78