The problem was that get_square_distance() made the screen one pixel larger to
the bottom/right than it really was. Thus, the (x+0,y+0)-pixel of a screen that
was below or to the right of some other screen had distance zero to both of
these screens.
This commit fixes the screen size computation and adds a small unit test for
getbycoord() and get_square_distance().
Reported by Elv13 here:
https://github.com/awesomeWM/awesome/pull/878#issuecomment-219272864
Signed-off-by: Uli Schlachter <psychon@znc.in>
Uli Schlachter