Sets the Leaflet to be homogeneous or not for the given fold and orientation.
If it is homogeneous, the Leaflet will request the same width or height for all its children depending on the orientation. If it isn't and it is folded, the leaflet may change width or height when a different child becomes visible.
| this |
a Leaflet |
| fold |
the fold |
| orientation |
the orientation |
| homogeneous |
true to make this homogeneous |