Disable Edit menu Undo/Redo when stack is empty

Wire the title bar's Edit menu Undo/Redo items through can_undo/can_redo
hooks on EditorActionHooks so they gray out when there's nothing to do —
matches the viewport header behaviour.

Updates the roadmap to mark the inspector lock, history panel, and
dimmed undo/redo entries complete.

Author: RenzoraEngine

crates/renzora_editor_framework/src/lib.rs

@@ -41,6 +41,8 @@ pub use toolbar_registry::{ToolEntry, ToolSection, ToolbarRegistry};
 pub struct EditorActionHooks {
     pub undo: Option<fn(&mut bevy::prelude::World)>,
     pub redo: Option<fn(&mut bevy::prelude::World)>,
+    pub can_undo: Option<fn(&bevy::prelude::World) -> bool>,
+    pub can_redo: Option<fn(&bevy::prelude::World) -> bool>,
 }
 
 /// Debounce state for the auto-save layout system — tracks "dirty since N
@@ -761,6 +763,15 @@ pub fn editor_ui_system(world: &mut World) {
     let mut window_queue = world
         .remove_resource::<renzora_ui::window_chrome::WindowActionQueue>()
         .unwrap_or_default();
+    let (can_undo, can_redo) = world
+        .get_resource::<EditorActionHooks>()
+        .map(|h| {
+            (
+                h.can_undo.map(|f| f(world)).unwrap_or(false),
+                h.can_redo.map(|f| f(world)).unwrap_or(false),
+            )
+        })
+        .unwrap_or((false, false));
     let title_action = renzora_ui::title_bar::render_title_bar(
         &ctx,
         &theme,
@@ -770,6 +781,8 @@ pub fn editor_ui_system(world: &mut World) {
         sign_in_open,
         signed_in_username.as_deref(),
         &mut window_queue,
+        can_undo,
+        can_redo,
     );
 
     // 6. Document tabs (below title bar)

crates/renzora_ui/src/title_bar.rs

@@ -66,6 +66,8 @@ pub fn render_title_bar(
     sign_in_open: bool,
     signed_in_username: Option<&str>,
     window_queue: &mut WindowActionQueue,
+    can_undo: bool,
+    can_redo: bool,
 ) -> TitleBarAction {
     let mut action = TitleBarAction::None;
     let mut any_widget_hovered = false;
@@ -164,11 +166,11 @@ pub fn render_title_bar(
                 switch_top_menu_on_hover(ui.ctx(), &file_menu.response);
 
                 let edit_menu = ui.menu_button("Edit", |ui| {
-                    if ui.button("Undo").clicked() {
+                    if ui.add_enabled(can_undo, egui::Button::new("Undo")).clicked() {
                         action = TitleBarAction::Undo;
                         ui.close();
                     }
-                    if ui.button("Redo").clicked() {
+                    if ui.add_enabled(can_redo, egui::Button::new("Redo")).clicked() {
                         action = TitleBarAction::Redo;
                         ui.close();
                     }

crates/renzora_undo/src/lib.rs

@@ -149,9 +149,25 @@ impl Plugin for UndoPlugin {
             .resource_mut::<renzora_editor_framework::EditorActionHooks>();
         hooks.undo = Some(undo_once);
         hooks.redo = Some(redo_once);
+        hooks.can_undo = Some(can_undo_active);
+        hooks.can_redo = Some(can_redo_active);
     }
 }
 
+fn can_undo_active(world: &World) -> bool {
+    world
+        .get_resource::<UndoStacks>()
+        .map(|s| s.can_undo(&s.active))
+        .unwrap_or(false)
+}
+
+fn can_redo_active(world: &World) -> bool {
+    world
+        .get_resource::<UndoStacks>()
+        .map(|s| s.can_redo(&s.active))
+        .unwrap_or(false)
+}
+
 fn shortcut_input(
     keys: Res<ButtonInput<KeyCode>>,
     bindings: Option<Res<renzora::keybindings::KeyBindings>>,

roadmap.md

@@ -23,7 +23,7 @@
 - Add property undo/redo history
 
 ## Inspector — Views & Filtering
-- Add lock inspector to entity (stop following selection)
+- ✅ Add lock inspector to entity (stop following selection) — [`c5fd231`](https://github.com/renzora/engine/commit/c5fd231)
 - Add multi-entity comparison view
 - ✅ Add component search/filter — [`3a3e9d2`](https://github.com/renzora/engine/commit/3a3e9d2)
 - Add component presets/templates
@@ -93,6 +93,7 @@
 ## Editor UX — Undo/Redo & Clipboard
 - ✅ Add global undo/redo system across all editors — [`63fd98e`](https://github.com/renzora/engine/commit/63fd98e)
 - ✅ Wire undo/redo to viewport toolbar and Edit menu — [`cc028c8`](https://github.com/renzora/engine/commit/cc028c8)
+- ✅ Add History panel showing undo/redo stack with click-to-jump — [`dfb7b94`](https://github.com/renzora/engine/commit/dfb7b94)
 - Add global clipboard for entities/components/nodes
 
 ## Editor UX — Layouts & Help
@@ -526,7 +527,7 @@
 
 ## Small Bugs / Polish
 - Ensure all nav mesh collider types are handled (segment, triangle, polyline, halfspace, custom, voxels currently warn)
-- Fix dimmed undo/redo buttons throughout editor (no-op)
+- ✅ Fix dimmed undo/redo buttons throughout editor (no-op)
 - Handle set_menu_item_checked in plugin host
 
 ## Documentation