selectable text option

Add a selectable text option to various note views. We don't want
selection events to interfere with back drag, so this is the first step
toward ensure back drag works.

Vertical scrollviews also interfere with back drag, so we'll still need
a way to compose gestures. It's not clear if this is currently possibly
with egui (union of responses somehow maybe?)

Signed-off-by: William Casarin <jb55@jb55.com>

src/actionbar.rs

@@ -138,6 +138,8 @@ impl NewThreadNotes {
     /// Simple helper for processing a NewThreadNotes result. It simply
     /// inserts/merges the notes into the thread cache
     pub fn process(&self, thread: &mut Thread) {
-        thread.view.insert(&self.notes);
+        // threads are chronological, ie reversed from reverse-chronological, the default.
+        let reversed = true;
+        thread.view.insert(&self.notes, reversed);
     }
 }