Richard Stallman wrote:

>What will happen if the user deletes all the text in the editable field,
>then inserts new text?  Will that newly inserted text be treated
>as part of a neighboring widget?  It seems likely.
>  
>
You are right, zero-sized overlays cannot be ignored as I did. Such 
overlays should only go in overlays-after. This is done in the patch 
attached.

>I don't think it is worth spending a lot of time to fix this,
>because I think it is fundamentally impossible, and there are
>more important things to do.
>
I don't see why it should be fundamentally impossible to fix this bug. 
AFAICS a widget cannot have zero size, and if it has a zero-sized 
overlay at one end, it is at the start.

I want to fix this bug because it annoys me in some tests I am doing.
I suggest we install my patch. It can always be removed if it has 
undesirable consequences.

>For instance, would you be interested
>in working on making saving of text properties in files more
>convenient?  That is more important.
>
I would be happy to work much more on Emacs. However, that requires 
someone to finance it :-). Right now I don't have the time :-(.