Sets the adjustment to be used as the “model” object for the `GtkRange`
The adjustment indicates the current range value, the minimum and maximum range values, the step/page increments used for keybindings and scrolling, and the page size.
The page size is normally 0 for `GtkScale` and nonzero for `GtkScrollbar`, and indicates the size of the visible area of the widget being scrolled. The page size affects the size of the scrollbar slider.
| this |
a `GtkRange` |
| adjustment |
a `GtkAdjustment` |