[xmonad] Border widths

[Dominik Schrempf]

Hello,

is it possible to decrease border width when windows are adjacent?
E.g., if the border width is 1px, adjacent windows are separated by a
border of 2px while windows are separated by borders of size 1px from
the edges of the screen.

It would be nice to be able to merge borders between adjacent windows,
focusedBorderColor should have precedence such that windows facing a
focussed window actually do not have a border with normalBorderColor on
that side.

Thank you,
Dominik