This requests that this minimize child if it knows how.
If not, it should suggest the gravity for child if it knows how to determine that. For example, a
DockBin might know if the widget was part of the right panel and therefore may set
position to gtk_pos_right.
| this |
a DockItem |
| child |
A DockItem that is a child of this |
| position |
A location for a PositionType |
|
true if |