RenderObjectElement methods

Supported by Flutter Fix: yes

The following RenderObjectElement methods were deprecated in v1.21.

insertChildRenderObject

moveChildRenderObject

removeChildRenderObject

These methods are replaced, respectively, by:

insertRenderObjectChild

moveRenderObjectChild

removeRenderObjectChild

These changes were made as a soft breaking deprecation in order to change the
function signature.

Migration guide

Code before migration:

element

insertChildRenderObject

child

slot

);

element

moveChildRenderObject

child

slot

);

element

removeChildRenderObject

child

);

Code after migration: