Tabbed: correctly pass events to other children

When passing an event to the focused tab and it is not handled, the
other children weren't then each called to see if they handle the
event. That led to refresh events etc not being processed by the mail
list tab if it wasn't focused.

src/components/utilities.rs

@@ -1864,7 +1864,14 @@ impl Component for Tabbed {
             }
             _ => {}
         }
-        self.children[self.cursor_pos].process_event(event, context)
+        let c = self.cursor_pos;
+        self.children[c].process_event(event, context)
+            || self.children.iter_mut().enumerate().any(|(idx, child)| {
+                if idx == c {
+                    return false;
+                }
+                child.process_event(event, context)
+            })
     }
     fn is_dirty(&self) -> bool {
         self.dirty || self.children[self.cursor_pos].is_dirty()