Repeated grid: field overwritten when adding iteration with menu

[ebruchez]

It doesn't happen when using the "+" icon.

I thought it looked like a regression from #3134 but this happens in a different circumstance.

+1 from customer

[ebruchez]

That's because we first remove the source:

<xf:delete ref="$source"/>

And then we insert it alongside the new iteration:

<xf:insert
    context="$context"
    ref="$items[$p - 1]"
    origin="$source, frf:updateTemplateFromInScopeItemsetMaps($repeat-context, $repeat-template)"
    position="after"
    xxf:defaults="{$apply-defaults}"/>

But the xxf:defaults applies to both rows.