Unedit nodes early when closing scene tab #80849
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Same error as in #80609 also affects GridMap and probably other node-based editors. The reason is that when scene was closed, the editor selection was cleared in a deferred manner, so by the time editors received
edit(nullptr)to unedit node, the node was already freed.This PR ensures that the editors can properly unedit nodes before they are freed.
#80610 is not needed anymore after this change.