diff --git a/crates/ui-egui/src/panels/timeline.rs b/crates/ui-egui/src/panels/timeline.rs
index 50a341ee..77916d09 100644
--- a/crates/ui-egui/src/panels/timeline.rs
+++ b/crates/ui-egui/src/panels/timeline.rs
@@ -578,6 +578,18 @@ pub fn begin_rename(app: &mut EffectcraftApp, ctx: &egui::Context) {
     }
 }
 
+/// What double-clicking a layer's name or bar does, as in After Effects: a precomp opens, footage
+/// and solids open in the Layer panel (paint happens there), text is edited in the viewer with the
+/// whole text selected. `None`: the name renames, the bar does nothing.
+fn double_click_action(layer: &Layer) -> Option<(String, serde_json::Value)> {
+    match &layer.source {
+        LayerSource::Comp { item } => Some(("comp.open".into(), json!({"comp": item.0}))),
+        LayerSource::Footage { .. } | LayerSource::Solid { .. } => Some(("layer.openLayer".into(), json!({"layer": layer.id.0}))),
+        LayerSource::Text => Some(("text.edit".into(), json!({"layer": layer.id.0}))),
+        _ => None,
+    }
+}
+
 /// Open the rename field on layer `id`; it takes the keyboard focus on its first frame only.
 fn start_rename(ctx: &egui::Context, id: u64, name: &str) {
     ctx.data_mut(|d| {
@@ -1888,13 +1900,9 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                     }
                 }
                 if row_resp.double_clicked() {
-                    match &layer.source {
-                        LayerSource::Comp { item } => actions.push(("comp.open".into(), json!({"comp": item.0}))),
-                        // Footage and solids open in the Layer panel (paint happens there).
-                        LayerSource::Footage { .. } | LayerSource::Solid { .. } => {
-                            actions.push(("layer.openLayer".into(), json!({"layer": layer.id.0})));
-                        }
-                        _ => start_rename(&ctx, layer.id.0, &layer.name),
+                    match double_click_action(layer) {
+                        Some(a) => actions.push(a),
+                        None => start_rename(&ctx, layer.id.0, &layer.name),
                     }
                 }
                 layer_context_menu(&row_resp, &comp, layer, &selected, &mut actions);
@@ -2098,6 +2106,11 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
                     if lin.hovered() || lout.hovered() || lin.dragged() || lout.dragged() {
                         ctx.set_cursor_icon(egui::CursorIcon::ResizeHorizontal);
                     }
+                    if body.double_clicked()
+                        && let Some(a) = double_click_action(layer)
+                    {
+                        actions.push(a);
+                    }
                     let shift = ui.input(|i| i.modifiers.shift);
                     if let Some(layers) = (body.clicked() && shift).then(|| shift_range(&ctx, cid, &comp, &rows, &selected, layer.id)).flatten() {
                         // Shift-click: the layers from the last one clicked to this one, as in
diff --git a/crates/ui-egui/tests/ui_tabs.rs b/crates/ui-egui/tests/ui_tabs.rs
index 4d6777b6..7f4689bf 100644
--- a/crates/ui-egui/tests/ui_tabs.rs
+++ b/crates/ui-egui/tests/ui_tabs.rs
@@ -167,6 +167,18 @@ fn nested_comp_markers_show_on_the_precomp_bar() {
     assert!((h.state().session.time().seconds() - 1.0).abs() < 0.034, "{}", h.state().session.time().seconds());
 }
 
+/// #637: double-clicking a precomp layer's bar opens its comp, as double-clicking its name does.
+#[test]
+fn double_clicking_a_precomp_bar_opens_its_comp() {
+    let (mut h, pre, main) = harness();
+    h.state_mut().session.execute("comp.open", json!({"comp": main})).unwrap();
+    h.run_steps(4);
+    let l = h.state().session.project.comp(ItemId(main)).unwrap().layers[0].id.0;
+    let bar = rect(&h, &format!("timeline.layer.{l}.bar"));
+    click_n(&mut h, bar.center(), 2);
+    assert_eq!(h.state().session.active_comp_id(), Some(ItemId(pre)));
+}
+
 /// Issue #46: a panel dragged by its panel-menu (hamburger) button onto the left edge of another
 /// group docks there as its own group; dragging the gap between panels resizes them.
 #[test]
diff --git a/crates/ui-egui/tests/ui_text_edit.rs b/crates/ui-egui/tests/ui_text_edit.rs
index 6e16b676..d3be6a44 100644
--- a/crates/ui-egui/tests/ui_text_edit.rs
+++ b/crates/ui-egui/tests/ui_text_edit.rs
@@ -438,3 +438,29 @@ fn layer_new_text_menu_and_shortcut_start_typing_into_source_text() {
         assert_eq!(s.active_comp().unwrap().layer(LayerId(lid)).unwrap().name, "My First Project", "the name follows the text");
     }
 }
+
+/// Double-clicking a text layer in the Timeline, on its name or on its bar, edits its text in the
+/// Composition viewer with the whole text selected, as in After Effects (Enter renames).
+#[test]
+fn timeline_double_click_on_a_text_layer_edits_its_text() {
+    for target in ["row", "bar"] {
+        let mut s = Session::default();
+        s.execute("comp.new", json!({"name": "Type", "width": 640, "height": 360, "duration": 2})).unwrap();
+        let lid = s.execute("layer.newText", json!({"text": "alpha beta"})).unwrap()["layer"].as_u64().unwrap();
+        let mut h = Harness::builder().with_size(egui::vec2(1600.0, 1000.0)).with_step_dt(1.0 / 60.0).build_eframe(move |_| EffectcraftApp::new(s));
+        h.state_mut().show_panel(PanelKind::Composition);
+        h.run_steps(3);
+        let p = rect(&h, &format!("timeline.layer.{lid}.{target}")).center();
+        click(&mut h, p, Modifiers::NONE);
+        click(&mut h, p, Modifiers::NONE);
+        let (layer, text, anchor, caret) = edited(&h);
+        assert_eq!(layer, lid, "{target}");
+        assert_eq!((anchor.min(caret), anchor.max(caret)), (0, 10), "everything selected ({target})");
+        assert!(h.state().auto.find(&format!("timeline.layer.{lid}.nameEdit")).is_none(), "no rename field ({target})");
+        assert_eq!(text, "alpha beta");
+        type_text(&mut h, "gamma");
+        key(&mut h, Key::Escape, Modifiers::NONE);
+        assert!(h.state().session.state.text_edit.is_none(), "Escape commits ({target})");
+        assert_eq!(layer_doc(&h.state().session, LayerId(lid)).unwrap().text, "gamma", "typing replaced the text ({target})");
+    }
+}