[fractal/fractal-next] timeline: Fix day divider position in list

[Julian Sparber <jsparber src gnome org>]

commit 6d7cf7fc7ef6bc334dd1d262ad015abc966f3fa9
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sat Nov 13 16:00:38 2021 +0100

    timeline: Fix day divider position in list
    
    Take into account added dividers to insert them in the right spot.

 src/session/room/timeline.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/session/room/timeline.rs b/src/session/room/timeline.rs
index 5359f975..3a4b268f 100644
--- a/src/session/room/timeline.rs
+++ b/src/session/room/timeline.rs
@@ -179,8 +179,8 @@ impl Timeline {
                 ItemType::DayDivider(date) => Some(date.clone()),
                 _ => None,
             });
-            for (position, date) in divider {
-                list.insert(position, date);
+            for (added, (position, date)) in divider.into_iter().enumerate() {
+                list.insert(position + added, date);
             }
 
             (added + divider_len) as u32