[LyX/master] Introduce maintain unincluded children "mostly"

[Jürgen Spitzmüller]

Am Samstag, den 14.03.2020, 20:37 -0400 schrieb Scott Kostyshak:
> The lyx16 ctests are now failing. Here's one manual reproduction:
> 
>   $ lyx -e lyx16x lib/examples/Welcome.lyx && lyx -e lyx16x
> lib/examples/Welcome.16.lyx
>   Warning: Malformed LyX document! Missing
> \maintain_unincluded_children.

Fixed.

Jürgen
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: This is a digitally signed message part
URL: <http://lists.lyx.org/pipermail/lyx-devel/attachments/20200315/5347ff51/attachment.asc>