bug#46827: Broken initial size of GTK3 frame

[martin rudalics]

>> The attached patch reverting 58430f29968a5661caff630d20dbbe7c864fe08d
>> and removing the entity above fixes the bug on master.
>
> Thanks, but removing the zero_vector entity is a non-starter.  We paid
> dearly for that change, so I don't want to get that problem back
> again.
>
> The other change is also quite important.
>
> We need to find a better way of fixing this problem.

Agreed to both.  I'd just have to understand first how the above can
and do affect redisplay.

martin