Force previews to update

[racoon]

I think the (instant) preview function (Insert > Preview) is really 
nice. In particular for the readability of references in a text. 
However, I noticed that I rarely use it. I think this has to do with the 
fact that LyX does not automatically update those when their content 
changes.

And I see why to have this done automatically is a bit tricky. I guess 
LyX would have to compare the current preview with a newly created 
preview when the document changes which in turn takes too much resources?

However, the next best thing would probably be a function to update all 
previews, maybe Document > Update > Instant Previews or so? There is no 
such thing if I see it correctly.

Daniel