[fractal/fractal-next] message-row: Reuse MessageFile when possible

[Julian Sparber <jsparber src gnome org>]

commit e8a44d752ec312f39d8bdcc7bd34e610e1e16733
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sat Dec 18 11:20:27 2021 +0100

    message-row: Reuse MessageFile when possible

 src/session/content/room_history/message_row/file.rs |  6 +++---
 src/session/content/room_history/message_row/mod.rs  | 13 +++++++++++--
 2 files changed, 14 insertions(+), 5 deletions(-)
---
diff --git a/src/session/content/room_history/message_row/file.rs 
b/src/session/content/room_history/message_row/file.rs
index eaa317dc..5466d4de 100644
--- a/src/session/content/room_history/message_row/file.rs
+++ b/src/session/content/room_history/message_row/file.rs
@@ -81,8 +81,8 @@ glib::wrapper! {
 }
 
 impl MessageFile {
-    pub fn new(filename: Option<String>) -> Self {
-        glib::Object::new(&[("filename", &filename)]).expect("Failed to create MessageFile")
+    pub fn new() -> Self {
+        glib::Object::new(&[]).expect("Failed to create MessageFile")
     }
 
     pub fn set_filename(&self, filename: Option<String>) {
@@ -106,6 +106,6 @@ impl MessageFile {
 
 impl Default for MessageFile {
     fn default() -> Self {
-        Self::new(None)
+        Self::new()
     }
 }
diff --git a/src/session/content/room_history/message_row/mod.rs 
b/src/session/content/room_history/message_row/mod.rs
index e604d8fe..d3a618b0 100644
--- a/src/session/content/room_history/message_row/mod.rs
+++ b/src/session/content/room_history/message_row/mod.rs
@@ -218,8 +218,17 @@ impl MessageRow {
                     }
                     MessageType::File(message) => {
                         let filename = message.filename.unwrap_or(message.body);
-                        let child = MessageFile::new(Some(filename));
-                        priv_.content.set_child(Some(&child));
+
+                        let child = if let Some(Ok(child)) =
+                            priv_.content.child().map(|w| w.downcast::<MessageFile>())
+                        {
+                            child
+                        } else {
+                            let child = MessageFile::new();
+                            priv_.content.set_child(Some(&child));
+                            child
+                        };
+                        child.set_filename(Some(filename));
                     }
                     MessageType::Image(message) => {
                         let child = MessageMedia::image(message, &event.room().session());