[LyX/master] Add "full" drawing strategy

[Richard Kimberly Heck]

On 6/11/24 12:06, Jean-Marc Lasgouttes wrote:
> 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). 

OK, go ahead.

Riki