Currently, Liferea uses PANGO_ELLIPSIZE_END for the renderers of the Headline column.
It would be great, especially for those of us using the "Wide View", to be able to have a tooltip when the text gets truncated. Some collaborative blogs use a headline style like "[title], by [author]", and it would be great to be able to read the title without pressing the item, which toggles the unread flag. (I sometimes like to keep up with a particular author now, and leave the others for later reading.)
Notice this patch only shows a tooltip when the text size doesn't fit. If there is enough room, no tooltip is ever shown: which I guess, could be annoying.
The patch applies only to the news tree_view. Do you want me to come up with a more generic patch that would apply to the subscriptions tree_view as well?