Fix incorrect application id when dragging and dropping files

crates/store/re_data_loader/src/load_file.rs

@@ -37,10 +37,12 @@ pub fn load_from_path(
 
     re_log::info!("Loading {path:?}…");
 
-    let application_id = path
-        .file_name()
-        .map(|f| f.to_string_lossy().to_string())
-        .map(ApplicationId::from);
+    // If no application ID was specified, we derive one from the filename.
+    let application_id = settings.application_id.clone().or_else(|| {
+        path.file_name()
+            .map(|f| f.to_string_lossy().to_string())
+            .map(ApplicationId::from)
+    });
     let settings = &crate::DataLoaderSettings {
         // When loading a LeRobot dataset, avoid sending a `SetStoreInfo` message since the LeRobot loader handles this automatically.
         force_store_info: !crate::lerobot::is_lerobot_dataset(path),

crates/store/re_data_loader/src/loader_mcap.rs

@@ -189,9 +189,7 @@ pub fn load_mcap(
     raw_fallback_enabled: bool,
 ) -> Result<(), DataLoaderError> {
     re_tracing::profile_function!();
-
-    // If there's an open store, use it. If there's no store yet, use the recommended id.
-    let store_id = settings.opened_store_id_or_recommended();
+    let store_id = settings.recommended_store_id();
 
     if tx
         .send(LoadedData::LogMsg(

crates/store/re_data_loader/src/loader_urdf.rs

@@ -84,7 +84,7 @@ impl DataLoader for UrdfDataLoader {
             robot,
             &filepath,
             &tx,
-            &settings.opened_store_id_or_recommended(),
+            &settings.recommended_store_id(),
             &settings.entity_path_prefix,
         )
         .with_context(|| "Failed to load URDF file!")?;
@@ -112,7 +112,7 @@ impl DataLoader for UrdfDataLoader {
             robot,
             &filepath,
             &tx,
-            &settings.opened_store_id_or_recommended(),
+            &settings.recommended_store_id(),
             &settings.entity_path_prefix,
         )
         .with_context(|| "Failed to load URDF file!")?;

crates/viewer/re_viewer/src/app.rs

@@ -2271,12 +2271,12 @@ impl App {
                     // welcome screen would end up in different recordings!
 
                     // If we don't have any application ID to recommend (which means we are on the welcome screen),
-                    // then we use the file path as the application ID or generate a new one using a UUID.
+                    // then we use the file path as the application ID or the file name if there is no path (on web builds).
                     let application_id = file
                         .path
                         .clone()
                         .map(|p| ApplicationId::from(p.display().to_string()))
-                        .unwrap_or(ApplicationId::random());
+                        .unwrap_or(ApplicationId::from(file.name.clone()));
 
                     // NOTE: We don't override blueprints' store IDs anyhow, so it is sound to assume that
                     // this can only be a recording.