[6.x] Fix asset index fieldtype slice length #13757
Merged
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While backporting #13708 to v5, I realized that the whole "show the 6th asset in place of the +1" logic wasn't even working as described. When you had 6 assets, you'd only get 5 and no +1.
The slice length is fixed now.
Also, it was using
splice, which in Vue 2 was causing an infinite re-render. Changingsplicetoslicefixes that -splicemodifies the original array andslicemakes a new one. Doesn't have that problem in Vue 3 but doesn't hurt to fix it.