Support for alternate slideshow path

Binary package hint: ubiquity

Hi,

In ubiquity/frontend/gtk_ui.py, slideshow location is hardcoded (slideshow_dir = '/usr/share/ubiquity-slideshow'). But ubiquity-slideshow-xubuntu ships its slideshows in /usr/share/ubiquity-slideshow-xubuntu (I thought it was better if it didn't conflict with ubiquity-slideshow-ubuntu, hence the different path). Unfortunately, this prevents our slideshows from being displayed.

I can move xubuntu's slideshows to /usr/share/ubiquity-slideshow and a conflicts: ubiquity-slideshow-ubuntu if this is the preferred solution.
Or, since ubiquity-slideshow-ubuntu/xubuntu aren't shipped together on the livecd, ubiquity could check for /usr/share/ubiquity-slideshow-xubuntu if /usr/share/ubiquity-slideshow doesn't exist.
Another solution (proposed by didrocks), is to use GDMSESSION (e.g., if it is defined, build the directory with something like slideshow_dir = '/usr/share/ubiquity-slideshow' + '-' + os.getenv('GDMSESSION')), but I don't know if it will behave correctly in "install only" mode, when the desktop environnement isn't started).

Any thought?
Thanks.