[LyX/master] Add "full" drawing strategy

[José Matos]

On Tue, 2024-06-11 at 11:44 -0400, Richard Kimberly Heck wrote:
> What's our policy on preference updates? (I can't remember.) Do we
> care if a preference file saved with 2.4.1 cannot be used with 2.4.0?

Does it make sense to have another option "auto" that automatically
chooses the best strategy?

That way we could assume that the previous default was auto and be done
with it.

I am aware that I am leaving many details on the air.

My motivation for this reasoning, other than to take care of the
conversion from previous versions, is also to assume that if I change
from X11 to Wayland (and vice-versa) we get the best choice available.

I am sure that you considered something like this. :-)

Best regards,
-- 
José Abílio