Hi,
I've cooked up a patch that adds a filter to only matches read articles.
The patch works well, with the only potential missing part being that
"match only read" and "match only unread" are mutually exclusive, so it
might be nice to have one untoggle the other if appropriate. I haven't
gotten far enough into the GTK programming docs to add this part, but I
was hoping to get some feedback on the feature as a whole before I do.
The patch can be found below, as well as attached along with its icon file
for the toolbar.
Thanks!