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Previously, DevTools recursed over both children and siblings during mount. This caused potential stack overflows when there were a lot of children (e.g. a list containing many items).
Given the following example component tree:
A
B C D
E F
G
A method that recurses for every child and sibling leads to a max depth of 6:
A
A -> B
A -> B -> E
A -> B -> C
A -> B -> C -> D
A -> B -> C -> D -> F
A -> B -> C -> D -> F -> G
The stack gets deeper as the tree gets either deeper or wider.
A method that recurses for every child and iterates over siblings leads to a max depth of 4:
A
A -> B
A -> B -> E
A -> C
A -> D
A -> D -> F
A -> D -> F -> G
The stack gets deeper as the tree gets deeper but is resilient to wide trees (e.g. lists containing many items).