Is it being thrown up as an Exception, or as a fatal error (like white screen with this line) ?

An MWException; the main background with navigation links and such still appears, and a stack trace is shown.

In T154379#2909041, @Pppery wrote:

An MWException; the main background with navigation links and such still appears, and a stack trace is shown.

Well, in that case it wont be an issue, I guess - as currently the right to move around something in Newsletter namespace is reserved for 'Administrators', and we cannot expect them to do things lik this!

Except that it seems to only require Autoconfirmed rights to move a newsletter (?)

In T154379#2909079, @Pppery wrote:

Except that it seems to only require Autoconfirmed rights to move a newsletter (?)

Hmm. That sounds strange. Can you confirm this with probably a new account (and in that case, please report)

The ? in the above comment meant "How odd", not "Maybe; unconfirmed"; I had already tested this before saying it.

T154383

In T154379#2909083, @Pppery wrote:

in T154379#2909079, @Pppery wrote:
Except that it seems to only require Autoconfirmed rights to move a newsletter (?)

The ? in the above comment meant "How odd", not "Maybe; unconfirmed"; I had already tested this before saying it.

Well. I got confsued with your use of 'seems'. Anyway, nice find and I can reproduce this.

@Pppery: @01tonythomas Cant reproduce error, when I move this to the another namespace, all description data/ after clicking edit button are lost. But no errors are thrown. Tried on fresh git clone. Maybe there's function to pass namespace to move form.

Well, in any case, my patch for T154380 seems to have fixed this as a side effect

Change 329815 had a related patch set uploaded (by Pppery):
Introduce stricter validation involving Newsletters' content models

https://gerrit.wikimedia.org/r/329815

Change 329815 merged by jenkins-bot:
Introduce stricter validation involving Newsletters' content models

https://gerrit.wikimedia.org/r/329815