Sets the alignment of the children within each line.
0 means the children are placed at the start of the line, 1 means they are placed at the end of the line. 0.5 means they are placed in the middle of the line.
Alignment is only used when [property@WrapLayout:justify] is set to [enum@Adw.JustifyMode.none], or on the last line when the [ property@WrapLayout:justify-last-line] is `FALSE`.
| this |
a wrap layout |
| align |
the child alignment |