Filter entities in the UI (part 7): Refactor and optimize `re_time_pa…

…nel` and add more tests (#8863)

Cargo.lock

@@ -6570,6 +6570,7 @@ dependencies = [
  "re_viewer_context",
  "re_viewport_blueprint",
  "serde",
+ "smallvec",
  "vec1",
 ]
 

crates/viewer/re_data_ui/src/item_ui.rs

@@ -185,8 +185,7 @@ pub fn instance_path_icon(
         if db
             .storage_engine()
             .store()
-            .all_components_on_timeline(timeline, &instance_path.entity_path)
-            .is_some()
+            .entity_has_data_on_timeline(timeline, &instance_path.entity_path)
         {
             &icons::ENTITY
         } else {

crates/viewer/re_time_panel/Cargo.toml

@@ -38,6 +38,7 @@ itertools.workspace = true
 nohash-hasher.workspace = true
 once_cell.workspace = true
 serde.workspace = true
+smallvec.workspace = true
 vec1.workspace = true
 
 [dev-dependencies]

crates/viewer/re_time_panel/src/data_density_graph.rs

@@ -3,7 +3,6 @@
 //! The data density is the number of data points per unit of time.
 //! We collect this into a histogram, blur it, and then paint it.
 
-use std::ops::RangeInclusive;
 use std::sync::Arc;
 
 use egui::emath::Rangef;
@@ -211,7 +210,6 @@ impl DensityGraph {
         y_range: Rangef,
         painter: &egui::Painter,
         full_color: Color32,
-        hovered_x_range: RangeInclusive<f32>,
     ) {
         re_tracing::profile_function!();
 
@@ -270,11 +268,8 @@ impl DensityGraph {
                 let inner_radius =
                     (max_radius * normalized_density).at_least(MIN_RADIUS) - feather_radius;
 
-                let inner_color = if hovered_x_range.contains(&x) {
-                    Color32::WHITE
-                } else {
-                    full_color.gamma_multiply(lerp(0.5..=1.0, normalized_density))
-                };
+                let inner_color = full_color.gamma_multiply(lerp(0.5..=1.0, normalized_density));
+
                 (inner_radius, inner_color)
             };
             let outer_radius = inner_radius + feather_radius;
@@ -417,8 +412,6 @@ pub fn data_density_graph_ui(
         row_rect.y_range(),
         time_area_painter,
         graph_color(ctx, &item.to_item(), ui),
-        // TODO(jprochazk): completely remove `hovered_x_range` and associated code from painter
-        0f32..=0f32,
     );
 
     if tooltips_enabled {