what is the arrow called?

[Mathias Brodala]

Hi,

ToddAndMargo schrieb am 11.11.2014 um 20:26:
> On an Xfce windows, in the upper left of the decorations strip,
> there is an up/down arrow that shrinks the window to the
> decoration strip or expands it back to its original shape.
> 
> What is this arrow called?

Not sure if that's what you mean but the function it triggers is called
"shading". It's based on the _NET_WM_ACTION_SHADE atom from the wm-spec[0].

Regards, Mathias

[0] http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html