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Updates Fail If Elements Are Not Direct Children. #246

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@rmorshea

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@rmorshea

This occurs because the path attribute of a LayoutUpdate is determined to be {path-of-parent-element}/children/{index} rather than {path-of-parent-element}/{path-within-element-model}/children/{index}. In other words the position of a child element in the model of its parent is ignored. Thus the following breaks the updates:

@idom.element
def Parent():
    return idom.html.div(idom.html.div(Child()))

@idom.element
def Child():
    state, set_state = idom.hooks.use_state(...)
    ... # define something that will cause an update somehow

Where calling set_state here triggers an update that fails to render in the client.

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