What is the difference between push, grow, and fill in MigLayout?

Question

I see that grow and push accept an optional weighting parameter, but apart from that: what is the real difference between grow, fill, and push? The documentation isn't very clear about that.

Answer 1

push affects only gaps, not elements, as far as I know. If a component is set to fill, this means to set all subcomponents to grow, while grow affects the component directly.

Answer 2

The push constraint does affect elements. It is only one of its contexts where it makes gaps greedy.

The answer is a bit more complex. I have provided it in a more recent question.