Ok, thanks. So I did git clone and saw that it already has been done (apparently since 2010-09-18 : https://git.gnome.org/browse/dia/commit/?id=9ac7c0aa4b2c1edc001fb5f9e2e0ce1803bae103). It is possible to set the line width attribute on UML lines using the Dia git version. Why this feature isn't available in the default Dia package (I'm under Debian) ?
> Message du 02/05/13 17:52
> De : "Alejandro Imass"
> A : "discussions about usage and development of dia"
> Copie à :
> Objet : Re: How to change the UML line width attribute ?
>
> On Thu, May 2, 2013 at 11:26 AM, Maxime Lecoq wrote:
> > Hi,
> >
> > I'm using Dia for making UML diagrams. I did success in changing the line
> > width of an UML class : double click on it (it opens its properties window),
> > go to the style panel and change the line width attribute (still wrote in
> > english in my french version by the way). This works good. Now, I would like
> > to do the same thing with line beetween 2 classes (inheritance,
> > implementation...). When I double click on a line (or do a right click and
> > select properties), there is no line width attribute... How could I do ?
> >
>
> No can do in the associations currently. Since the primitive lines are
> able to do this, my guess is that you could hack the UML sheet and add
> this attribute and possibly contribute it back to the project as a
> patch.
>
> Cheers,
>
> --
> Alejandro Imass
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