expandIn
Expands the space the content is given, from initialSize to the content's full size.
The content keeps its own size and is aligned inside that space, so the corner expandFrom names stays in place. Content outside the space is clipped when clip is true.
The container reports that space as its preferred size. The clip and the alignment follow the space, not the bounds the parent assigns, so a parent that stretches the container shows the same animation. For one axis, use expandHorizontally or expandVertically.
Return
the enter transition.
Parameters
how the space travels, a medium-low stiffness spring by default.
the corner the space grows from, the bottom trailing one by default.
whether to clip content to the animated space; true by default.
the space the content starts in, given its full size; empty by default.