[fractal] Ctrl+PgDn should switch to the first room if none is selected

[Daniel Garcia Moreno <danigm src gnome org>]

commit 1971aa247f160caf29088b6d381a1caeb1a07f9a
Author: Vancha March <vancha@192.168.2.5>
Date:   Mon Sep 7 15:09:34 2020 +0200

    Ctrl+PgDn should switch to the first room if none is selected

 fractal-gtk/src/actions/global.rs | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/fractal-gtk/src/actions/global.rs b/fractal-gtk/src/actions/global.rs
index 9a079cb9..936e55cf 100644
--- a/fractal-gtk/src/actions/global.rs
+++ b/fractal-gtk/src/actions/global.rs
@@ -166,12 +166,20 @@ pub fn new(app: &gtk::Application, op: &Arc<Mutex<AppOp>>) {
         let mut op = op.lock().unwrap();
         if let Some(id) = op.roomlist.prev_id() {
             op.set_active_room_by_id(id);
+        } else {
+            if let Some(last_room) = op.roomlist.last_id() {
+                op.set_active_room_by_id(last_room);
+            }
         }
     }));
     next_room.connect_activate(clone!(@strong op => move |_, _| {
         let mut op = op.lock().unwrap();
         if let Some(id) = op.roomlist.next_id() {
             op.set_active_room_by_id(id);
+        } else {
+            if let Some(first_room) = op.roomlist.first_id() {
+                op.set_active_room_by_id(first_room);
+            }
         }
     }));
     prev_unread_room.connect_activate(clone!(@strong op => move |_, _| {