fix #8832: duplicate keys detected not warned #8881
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…patchVnodes function. Added a check for duplicated keys in the case that addVnodes is called instead of createChildren or updateChildren. This cover the case when a empty div is change into a div with a list of childrens with a duplicated key inside after initial rendering (see issue vuejs#8832). fix vuejs#8832
…warning in the case of patchVno This test cover the case that a empty div changes to a div with children with repeated keys after initial load (see issue vuejs#8832). test vuejs#8832
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