Container can lose its child's state #161698
Description
Use case
The Container widget changes the tree hierarchy when its arguments change. This causes its child will lose its state if it doesn't have a global key.
Example by @justinmc: https://dartpad.dev/?id=bd243d23a7fd661563519c3eebece032
Proposal
If possible, we should fix Container such that updating its configuration doesn't cause its child to lose state.
If not possible, we should update Container's docs to explain this problem and how to use a global key to workaround it.