feat(ui): latest_event sorter handles LatestEventValue::LocalHasBeenSent.

This patch changes the semantics of the Room List `latest_event`
sorter by changing “is local” to “is remote like”, to include the new
`LatestEventValue::LocalHasBeenSent` variant.

crates/matrix-sdk-base/src/latest_event.rs

@@ -65,6 +65,18 @@ impl LatestEventValue {
         }
     }
 
+    /// Check whether the [`LatestEventValue`] represents an unsent event, i.e.
+    /// is [`LocalIsSending`] nor [`LocalCannotBeSent`].
+    ///
+    /// [`LocalIsSending`]: LatestEventValue::LocalIsSending
+    /// [`LocalCannotBeSent`]: LatestEventValue::LocalCannotBeSent
+    pub fn is_unsent(&self) -> bool {
+        match self {
+            Self::LocalIsSending(_) | Self::LocalCannotBeSent(_) => true,
+            Self::LocalHasBeenSent(_) | Self::Remote(_) | Self::None => false,
+        }
+    }
+
     /// Check whether the [`LatestEventValue`] is not set, i.e. [`None`].
     ///
     /// [`None`]: LatestEventValue::None

crates/matrix-sdk-base/src/room/latest_event.rs

@@ -31,8 +31,8 @@ impl Room {
         self.info.read().latest_event_value.timestamp()
     }
 
-    /// Return the value of [`LatestEventValue::is_local`].
-    pub fn latest_event_is_local(&self) -> bool {
-        self.info.read().latest_event_value.is_local()
+    /// Return the value of [`LatestEventValue::is_unsent`].
+    pub fn latest_event_is_unsent(&self) -> bool {
+        self.info.read().latest_event_value.is_unsent()
     }
 }