Stumbled upon little nuisance and it's better to explain on gifs.
First check this and notice rectangle appearing around folder icon and name, excluding node. Yet there is some extra space to the right.
Now check this, that with "All white space" Glider's activation area, the border to call Glider on right side is quite similar with rectangle right side from previous gif.
Finally check this, and notice how on left side while Glider's rectangle shows to cover same extra space as on the right side, actually the activation zone starts straight after node's left border.
I'd say this adds a confusion, as observing Glider's rectangle one expects that whole to be "safe zone", and on right side it is so, but on left it isn't. So either rectangle should show this properly(drawn rectangle should end straight on the left side of node), or "All while space" should honour whole Glider's rectangle area.