regression: active area for resizing tiled windows shrank to a 1px
A negative side effect of the dropshadow shrinking to a 1px border was that the active area to resize the tiled windows is now an unusable 1px. We should investigate ways of how to bring it to around 10-12px, preferably centered around the border. If we fail to address it, work aorund it by getting the previous (somewhat faulty) behavior of having the shadow act as that resize control (having a +-transparent shadow)