Liferea irritated me for many years with a strange behavior when dragging a subscription. You mouse down on the feed, it becomes selected — so far so good. Then you drag it somewhere — possibly far off screen, making the view scroll — then drop it. Drops fine, updates the DB, model, and the view fine. But! The selection then jumps to a completely random feed somewhere.
Well, it's not actually random. What happens instead, the GtkTreeView implements DnD by removing a row, then re-inserting it. When a selected row is removed, obviously the selection has to disappear, but instead it's set to the next row after the removed one. I suppose I may be uniquely vulnerable to this because I have 300+ feeds and I drag them around all the time. If Liferea weren't kind enough to remember the preferred order, this would not matter so much.
I meant to fix this for a long time, but somehow a wrong information got stuck in my head: I thought that Liferea was written in C++, so it took years to gather the motivation. Imagine my surprise when I found plain old C. I spent a good chunk of Sunday figuring out GTK's tree view thingie, but in the end it was quite simple.