Make the blueprint timeline useful with an option to disable GC

crates/re_viewer/src/app.rs

@@ -1042,7 +1042,7 @@ impl eframe::App for App {
             // Save the blueprints
             // TODO(#2579): implement web-storage for blueprints as well
             if let Some(hub) = &mut self.store_hub {
-                match hub.gc_and_persist_app_blueprints() {
+                match hub.gc_and_persist_app_blueprints(&self.state.app_options) {
                     Ok(f) => f,
                     Err(err) => {
                         re_log::error!("Saving blueprints failed: {err}");

crates/re_viewer/src/store_hub.rs

@@ -5,7 +5,7 @@ use re_arrow_store::{DataStoreConfig, DataStoreStats};
 use re_data_store::StoreDb;
 use re_log_encoding::decoder::VersionPolicy;
 use re_log_types::{ApplicationId, StoreId, StoreKind};
-use re_viewer_context::StoreContext;
+use re_viewer_context::{AppOptions, StoreContext};
 
 use re_arrow_store::StoreGeneration;
 
@@ -278,7 +278,10 @@ impl StoreHub {
     /// Persist any in-use blueprints to durable storage.
     // TODO(#2579): implement persistence for web
     #[allow(clippy::unnecessary_wraps)]
-    pub fn gc_and_persist_app_blueprints(&mut self) -> anyhow::Result<()> {
+    pub fn gc_and_persist_app_blueprints(
+        &mut self,
+        app_options: &AppOptions,
+    ) -> anyhow::Result<()> {
         re_tracing::profile_function!();
         // Because we save blueprints based on their `ApplicationId`, we only
         // save the blueprints referenced by `blueprint_by_app_id`, even though
@@ -287,7 +290,9 @@ impl StoreHub {
         for (app_id, blueprint_id) in &self.blueprint_by_app_id {
             if let Some(blueprint) = self.store_bundle.blueprint_mut(blueprint_id) {
                 if self.blueprint_last_save.get(blueprint_id) != Some(&blueprint.generation()) {
-                    blueprint.gc_everything_but_the_latest_row();
+                    if !app_options.disable_blueprint_gc {
+                        blueprint.gc_everything_but_the_latest_row();
+                    }
 
                     #[cfg(not(target_arch = "wasm32"))]
                     {

crates/re_viewer/src/ui/rerun_menu.rs

@@ -363,6 +363,12 @@ impl App {
         )
             .on_hover_text("Show the Blueprint data in the Time Panel tree view. This is useful for debugging the internal blueprint state.");
 
+        self.re_ui.checkbox(ui,
+                       &mut self.state.app_options.disable_blueprint_gc,
+                       "Disable the blueprint GC",
+        )
+            .on_hover_text("Don't GC the blueprint data. This is useful for debugging the internal blueprint state.");
+
         self.re_ui
             .checkbox(
                 ui,

crates/re_viewer_context/src/app_options.rs

@@ -26,6 +26,9 @@ pub struct AppOptions {
     /// Includes the blueprint in the timeline view.
     pub show_blueprint_in_timeline: bool,
 
+    /// Includes the blueprint in the timeline view.
+    pub disable_blueprint_gc: bool,
+
     /// What time zone to display timestamps in.
     pub time_zone_for_timestamps: TimeZone,
 }
@@ -49,6 +52,8 @@ impl Default for AppOptions {
 
             show_blueprint_in_timeline: false,
 
+            disable_blueprint_gc: false,
+
             time_zone_for_timestamps: TimeZone::Utc,
         }
     }