Signals: tab_changed now is emitted when it's on scene tree #36613
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This is actually a fix by @kuruk-mm from #36426, but since it's not directly depend on that WIP PR I'll pushing it as standalone. It fixes a bug where TabContainer's
add_child_notifywould emit a signal even if not in the scene tree, potentially triggering crashes in connected callbacks that assume that scene nodes are initialized.The
callable_mpchanges in #36246 expose that issue.