[LyX/master] Add "full" drawing strategy

[Jean-Marc Lasgouttes]

Le 11/06/2024 à 17:44, Richard Kimberly Heck a écrit :
> On 6/11/24 09:36, Jean-Marc Lasgouttes wrote:
>> The point is to offer a mode where the screen is redrawn fully every 
>> time (only the drawing, not the metrics computation). The performance 
>> seems quite reasonable to me, actually.
> 
> I assume it is otherwise safe?

This is what I assume too :) All it does is to add the Update::ForceDraw 
flag to force a full redraw. So it goes through known drawing mechanisms 
to do its thing.

>> Having a proper UI for it would be great, but I am procrastinating on 
>> that.
> 
> 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?

This is a good question. As it is, it will fall back to the default 
value ("partial" if supported, "backingstore" otherwise) if it does not 
understand the value that was given (I just checked). The only harm is a 
warning on the console.

JMarc