luci-base: cbi.js: utilize node.closest() if available
authorJo-Philipp Wich <jo@mein.io>
Sat, 20 Oct 2018 07:55:59 +0000 (09:55 +0200)
committerJo-Philipp Wich <jo@mein.io>
Mon, 5 Nov 2018 10:01:45 +0000 (11:01 +0100)
Use node.closest() in findParent() when available since it should be faster
than manaually traversing the ancestor chain.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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