Assertion when selecting large table in User Guide on master

[Jean-Marc Lasgouttes]

Le 02/07/2024 à 17:44, Scott Kostyshak a écrit :
> Oops, sorry about that. Backtrace now attached.
> 
> The way I reproduce is just drag selection with my mouse up and down, up
> and down in the User Guide. It usually just takes a few seconds.

I can reproduce too. The goodpart is that the assertion about 
ParagraphMetrics::havePosition is something I added recently.

We want to avoid to read the position of a paragraph which does not have 
a position yet.

JMarc