the abstract/summary portion of a patent is worthless. It's just a executive summary.

You have to look at the steps.

A patent is a recipe for 'creating' the invention. You do A, and B, and C, and then D, and then furthermore E... etc etc. You have to look at those steps and understand what they mean to see what the actual patent is about.

So if the patent says 'You need to do A, B, C, and D' and Gnome does "A, B, and D", but not C... then Gnome doesn't violate the patent.

Changing the behavior of the application or showing how the application doesn't follow all the steps outlined in the patent is probably the most effective way to 'defeat' a patent.

But regardless it's a frivolous lawsuit that will likely cost Gnome a lot of money and time for no good reason.