set_child_enabled
Description:
Sets whether child is enabled.
If a child is disabled, it will be ignored when looking for the child fitting the available size best. This allows to programmatically and prematurely hide a child of this even if it fits in the available space.
This can be used e.g. to ensure a certain child is hidden below a certain window width, or any other constraint you find suitable.
Parameters:
| this | a squeezer | 
| child | a child of this | 
| enabled | whether to enable the child |