Preact: 10.0.0-alpha.0 - compat cloneElement ignoring props and children

[dsgh]

I believe this bug might have originated here: https://github.com/developit/preact/commit/d3c12b7ea3c16f0fa545842ac3bd2b79567e347c

[marvinhagemeister]

Can you share some code where the issue can be reproduced? Something like a simple snippet in CodeSandbox helps tremendously in fixing issues.

EDIT: Can confirm this via this test case: https://codesandbox.io/s/y32qooolx9

[dsgh]

@marvinhagemeister Here is a snippet showing a difference between using cloneElement from preact vs from preact/compat https://codesandbox.io/s/34z0lkm6pm

[marvinhagemeister]

Ok, I was able to narrow down the issue to using compat together with createElement from core. Because we're only checking for $$typeof to mark a vnode as valid it seems like we need to allow standard preact vnodes, too. Will investigate further.