feat(ribbon): highlight the running command's button

A command started from the command line, an alias, a shortcut or Repeat
now lights the same ribbon button a click on it would, so users learn
where the tools they type live. A button inside a dropdown lights the
dropdown, a slide-out tool lights its group title, a tool hidden in a
collapsed panel lights the panel's opener, and a button on another tab
lights that tab's header. Always on, in the existing active-button blue.

Buttons are matched by the command they dispatch, so ids that differ
from their command still resolve; the tab on show wins when a command
appears twice, and a clicked button keeps its highlight. Transparent
commands leave the running command lit. The #355 rule that a highlight
lasts only while something runs moves from the ribbon click handler into
dispatch_command, so typed commands are cleared the same way.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/commands/mod.rs

@@ -92,7 +92,26 @@ impl OpenCADStudio {
     }
 
     pub(super) fn dispatch_command(&mut self, cmd: &str) -> Task<Message> {
-        self.dispatch_command_inner(cmd, false)
+        let task = self.dispatch_command_inner(cmd, false);
+        self.clear_idle_tool_highlight();
+        task
+    }
+
+    /// Turn the ribbon highlight off when the command just dispatched left
+    /// nothing running: no interactive command, dialog or navigation mode.
+    /// One-shot commands (view changes, clipboard, toggles, audits…) would
+    /// otherwise leave it lit forever; interactive commands and dialog owners
+    /// keep theirs until the command end / modal close clears it. (#355)
+    pub(in crate::app) fn clear_idle_tool_highlight(&mut self) {
+        let i = self.active_tab;
+        if self.tabs[i].active_cmd.is_none()
+            && self.active_modal.is_none()
+            && !self.tabs[i].pan_mode
+            && !self.tabs[i].orbit_mode
+            && !self.tabs[i].zoom_dynamic_mode
+        {
+            self.ribbon.deactivate_tool();
+        }
     }
 
     /// Dispatch a verb typed at the interactive command line, falling back to
@@ -104,7 +123,9 @@ impl OpenCADStudio {
     /// callers (ribbon, plugins, headless automation) use `dispatch_command`
     /// and never get silent substitution.
     pub(super) fn dispatch_command_or_suggest(&mut self, cmd: &str) -> Task<Message> {
-        self.dispatch_command_inner(cmd, true)
+        let task = self.dispatch_command_inner(cmd, true);
+        self.clear_idle_tool_highlight();
+        task
     }
 
     fn dispatch_command_inner(&mut self, cmd: &str, allow_suggest: bool) -> Task<Message> {
@@ -205,6 +226,12 @@ impl OpenCADStudio {
             return Task::none();
         }
 
+        // Light the ribbon button of the command now starting, however it was
+        // started (typed, alias, shortcut, Repeat), so the user sees where it
+        // lives. A transparent command returned above and leaves the running
+        // command's highlight alone.
+        self.ribbon.show_command(cmd);
+
         if !self.suppress_plugin_dispatch && crate::plugin::try_dispatch(self, i, cmd) {
             // try_dispatch returns true for both finished commands and interactive
             // commands that it just installed. If no command is now active, the
@@ -1071,3 +1098,44 @@ fn strip_command_prefixes(cmd: &str) -> Option<&str> {
     let bare = cmd.trim_start_matches(['_', '.']);
     (bare.len() != cmd.len() && !bare.is_empty()).then_some(bare)
 }
+
+#[cfg(test)]
+mod ribbon_highlight_tests {
+    use crate::app::OpenCADStudio;
+
+    fn fresh() -> OpenCADStudio {
+        let mut app = OpenCADStudio::new_for_test();
+        app.automation_op(r#"{"op":"new"}"#);
+        app
+    }
+
+    #[test]
+    fn a_typed_alias_lights_the_button_of_the_command_it_starts() {
+        let mut app = fresh();
+        let _ = app.dispatch_command_or_suggest("O");
+        assert!(app.tabs[app.active_tab].active_cmd.is_some());
+        assert_eq!(app.ribbon.active_tool(), Some("OFFSET"));
+        let _ = app.dispatch_command_or_suggest("L");
+        assert_eq!(app.ribbon.active_tool(), Some("LINE"));
+    }
+
+    #[test]
+    fn a_transparent_command_keeps_the_running_command_lit() {
+        let mut app = fresh();
+        let _ = app.dispatch_command_or_suggest("LINE");
+        let _ = app.dispatch_command_or_suggest("'ZOOM E");
+        assert!(app.tabs[app.active_tab].active_cmd.is_some());
+        assert_eq!(app.ribbon.active_tool(), Some("LINE"));
+    }
+
+    #[test]
+    fn a_one_shot_command_leaves_nothing_lit() {
+        // REGEN cancels the running LINE and finishes at once, so neither
+        // its own button nor LINE's may stay lit.
+        let mut app = fresh();
+        let _ = app.dispatch_command_or_suggest("LINE");
+        let _ = app.dispatch_command_or_suggest("REGEN");
+        assert!(app.tabs[app.active_tab].active_cmd.is_none());
+        assert_eq!(app.ribbon.active_tool(), None);
+    }
+}

src/app/update/dialog.rs

@@ -120,25 +120,9 @@ pub(super) fn on_ribbon_tool_click(&mut self, tool_id: String, event: ModuleEven
                 self.ribbon.note_panel_tool(&tool_id);
                 self.ribbon.activate_tool(&tool_id);
                 match event {
-                    ModuleEvent::Command(cmd) => {
-                        let task = self.dispatch_command(&cmd);
-                        // One-shot tools (view changes, clipboard, toggles,
-                        // audits…) leave nothing running: no interactive
-                        // command and no dialog. Their highlight would stick
-                        // forever — turn it off now. Interactive commands and
-                        // dialog owners keep theirs; the command end / modal
-                        // close clears those. (#355)
-                        let i = self.active_tab;
-                        if self.tabs[i].active_cmd.is_none()
-                            && self.active_modal.is_none()
-                            && !self.tabs[i].pan_mode
-                            && !self.tabs[i].orbit_mode
-                            && !self.tabs[i].zoom_dynamic_mode
-                        {
-                            self.ribbon.deactivate_tool();
-                        }
-                        return task;
-                    }
+                    // `dispatch_command` turns a one-shot tool's highlight off
+                    // again once nothing is left running (#355).
+                    ModuleEvent::Command(cmd) => return self.dispatch_command(&cmd),
                     ModuleEvent::OpenFileDialog => {
                         self.command_line
                             .push_info(crate::t!("Open DWG/DXF: not yet implemented.").as_ref());

src/ui/ribbon/draw_panel.rs

@@ -207,22 +207,52 @@ pub(super) fn parent_panel(id: &str) -> Option<&'static str> {
     panel_for_dropdown(id).map(|panel| panel.id)
 }
 
-pub(super) fn group_title<'a>(
-    title: &'static str,
-    group_ids: &[&'static str],
-    open: &Option<String>,
-) -> Element<'a, Message> {
-    let Some(panel) = PANELS.iter().copied().find(|panel| {
+/// The slide-out under the title of the ribbon group `title`, whose items
+/// are `group_ids`.
+fn panel_for_group(title: &str, group_ids: &[&'static str]) -> Option<Panel> {
+    PANELS.iter().copied().find(|panel| {
         panel.title == title
             && !panel.tools.is_empty()
             && panel.anchor.is_none_or(|anchor| group_ids.contains(&anchor))
     })
-    else {
+}
+
+/// Every command the slide-out of the group `title` offers: each tool and
+/// each of its submenu options.
+pub(super) fn slide_out_commands(
+    title: &str,
+    group_ids: &[&'static str],
+) -> impl Iterator<Item = &'static str> {
+    panel_for_group(title, group_ids)
+        .into_iter()
+        .flat_map(|panel| panel.tools)
+        .flat_map(|tool| {
+            std::iter::once(tool.command).chain(tool.options.iter().map(|(cmd, _)| *cmd))
+        })
+}
+
+/// A slide-out tool is lit while it or one of its submenu options runs.
+fn tool_is_active(tool: &Tool, active_tool: Option<&str>) -> bool {
+    active_tool.is_some_and(|active| {
+        tool.command == active || tool.options.iter().any(|(cmd, _)| *cmd == active)
+    })
+}
+
+pub(super) fn group_title<'a>(
+    title: &'static str,
+    group_ids: &[&'static str],
+    open: &Option<String>,
+    active_tool: Option<&str>,
+) -> Element<'a, Message> {
+    let Some(panel) = panel_for_group(title, group_ids) else {
         return container(text(t!(title)).size(9).style(muted_text_style))
             .padding([1, 4])
             .into();
     };
     let expanded = open.as_deref().and_then(parent_panel) == Some(panel.id);
+    // A command running from the closed slide-out lights its title, the way a
+    // dropdown lights while one of its items runs.
+    let lit = expanded || panel.tools.iter().any(|tool| tool_is_active(tool, active_tool));
     let arrow = if expanded {
         icons::themed_arrow_up(GROUP_TITLE_ARROW_SIZE)
     } else {
@@ -239,7 +269,7 @@ pub(super) fn group_title<'a>(
             .align_y(iced::Center),
         )
         .on_press(Message::ToggleRibbonDropdown(panel.id.to_string()))
-        .style(move |theme: &Theme, status| tool_btn_style(theme, expanded, status))
+        .style(move |theme: &Theme, status| tool_btn_style(theme, lit, status))
         .padding([1, 4]),
     )
     .into();
@@ -421,7 +451,7 @@ pub(super) fn overlay<'a>(ribbon: &Ribbon, id: &str, win: (f32, f32)) -> Element
                         .map(|tool| {
                             tool_button(
                                 tool,
-                                ribbon.active_tool.as_deref() == Some(tool.command),
+                                tool_is_active(tool, ribbon.active_tool.as_deref()),
                                 panel.id,
                             )
                         })

src/ui/ribbon/locate.rs

@@ -0,0 +1,283 @@
+//! Where the ribbon offers a command, so a command started from the command
+//! line, an alias, a shortcut or Repeat lights the same button a click on it
+//! would. Seeing which button runs a typed command is how its place in the
+//! ribbon is learned.
+
+use crate::modules::{ModuleEvent, RibbonGroup, RibbonItem, ToolDef};
+
+use super::{draw_panel, item_id, Ribbon};
+
+/// One button of a group: the id its highlight is keyed on, and the command
+/// line it dispatches (`None` for a button that raises a non-command event).
+type Entry<'a> = (&'static str, Option<&'a str>);
+
+fn tool_entry(t: &ToolDef) -> Entry<'_> {
+    match &t.event {
+        ModuleEvent::Command(cmd) => (t.id, Some(cmd.as_str())),
+        _ => (t.id, None),
+    }
+}
+
+/// The buttons one ribbon item shows: itself, the items of a dropdown, or the
+/// small tools under a combo. A dropdown item is keyed on the command it
+/// dispatches, which is what the dropdown's highlight looks for.
+fn item_entries(item: &RibbonItem) -> Vec<Entry<'_>> {
+    match item {
+        RibbonItem::Tool(t) | RibbonItem::LabeledTool(t) | RibbonItem::LargeTool(t) => {
+            vec![tool_entry(t)]
+        }
+        RibbonItem::PropertiesGroup { match_prop } => vec![tool_entry(match_prop)],
+        RibbonItem::Dropdown { items, .. }
+        | RibbonItem::LabeledDropdown { items, .. }
+        | RibbonItem::LargeDropdown { items, .. } => {
+            items.iter().map(|(cmd, _, _)| (*cmd, Some(*cmd))).collect()
+        }
+        RibbonItem::ToolGrid { columns } | RibbonItem::StyleComboGroup { rows: columns, .. } => {
+            columns.iter().flatten().map(tool_entry).collect()
+        }
+        RibbonItem::LayerComboGroup { row2, row3 } => {
+            row2.iter().chain(row3).map(tool_entry).collect()
+        }
+    }
+}
+
+/// Every button `group` offers: its items' buttons and the tools of its title
+/// slide-out, keyed like dropdown items on the command they dispatch.
+pub(super) fn group_entries(group: &RibbonGroup) -> Vec<Entry<'_>> {
+    let mut out: Vec<_> = group.tools.iter().flat_map(item_entries).collect();
+    let ids: Vec<_> = group.tools.iter().filter_map(item_id).collect();
+    out.extend(draw_panel::slide_out_commands(group.title, &ids).map(|cmd| (cmd, Some(cmd))));
+    out
+}
+
+/// Whether `item` shows the button keyed `id`, lit or as the item a lit
+/// dropdown holds.
+pub(super) fn item_holds(item: &RibbonItem, id: &str) -> bool {
+    item_entries(item).iter().any(|(entry, _)| *entry == id)
+}
+
+/// Whether `group` holds the button keyed `id`.
+pub(super) fn group_holds(group: &RibbonGroup, id: &str) -> bool {
+    group_entries(group).iter().any(|(entry, _)| *entry == id)
+}
+
+impl Ribbon {
+    /// Every button of every tab, with the index of the tab it is on. The
+    /// tab on show comes first, so a command offered on two tabs lights the
+    /// button the user can already see.
+    fn entries(&self) -> impl Iterator<Item = (usize, Entry<'_>)> {
+        let order = std::iter::once(self.active)
+            .chain((0..self.modules.len()).filter(move |i| *i != self.active));
+        order
+            .filter_map(|i| self.modules.get(i).map(|m| (i, m)))
+            .flat_map(|(i, module)| {
+                module
+                    .ribbon_groups()
+                    .iter()
+                    .flat_map(group_entries)
+                    .map(move |entry| (i, entry))
+            })
+    }
+
+    /// The button id that runs the command line `cmd`: an exact match first,
+    /// then a button that runs its bare verb (`OFFSET 5` → Offset).
+    pub(super) fn tool_for_command(&self, cmd: &str) -> Option<&'static str> {
+        let cmd = cmd.trim();
+        let verb = cmd.split_whitespace().next().unwrap_or(cmd);
+        [cmd, verb].into_iter().find_map(|want| {
+            self.entries()
+                .find(|(_, (_, runs))| runs.is_some_and(|runs| runs.eq_ignore_ascii_case(want)))
+                .map(|(_, (id, _))| id)
+        })
+    }
+
+    /// Light the ribbon button of the command line `cmd` that is starting,
+    /// however it was started. A button the user just clicked to run `cmd`
+    /// stays lit, so a command offered on two tabs keeps the clicked one; a
+    /// command with no button clears the previous command's highlight.
+    pub fn show_command(&mut self, cmd: &str) {
+        let clicked = self.active_tool.as_deref().is_some_and(|current| {
+            self.entries().any(|(_, (id, runs))| {
+                id == current && runs.is_some_and(|runs| runs.eq_ignore_ascii_case(cmd.trim()))
+            })
+        });
+        if !clicked {
+            self.active_tool = self.tool_for_command(cmd).map(str::to_string);
+        }
+    }
+
+    /// The tab holding the lit button, when it is not the tab on show: its
+    /// header lights instead, pointing at where the button lives. The Layout
+    /// module has no tab (its tools are on the side toolbar).
+    pub(super) fn tab_holding_active_tool(&self) -> Option<usize> {
+        let id = self.active_tool.as_deref()?;
+        let holds = |i: usize| {
+            self.modules[i]
+                .ribbon_groups()
+                .iter()
+                .any(|group| group_holds(group, id))
+        };
+        if self
+            .modules
+            .get(self.active)
+            .is_some_and(|_| holds(self.active))
+        {
+            return None;
+        }
+        (0..self.modules.len()).find(|i| self.modules[*i].id() != "layout" && holds(*i))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::modules::{CadModule, IconKind};
+
+    struct TestTab {
+        id: &'static str,
+        groups: Vec<RibbonGroup>,
+    }
+
+    impl CadModule for TestTab {
+        fn id(&self) -> &'static str {
+            self.id
+        }
+        fn title(&self) -> &'static str {
+            self.id
+        }
+        fn ribbon_groups(&self) -> &[RibbonGroup] {
+            &self.groups
+        }
+    }
+
+    fn tool(id: &'static str, cmd: &str) -> ToolDef {
+        ToolDef {
+            id,
+            label: id,
+            icon: IconKind::Glyph("x"),
+            event: ModuleEvent::Command(cmd.to_string()),
+        }
+    }
+
+    /// Home: OFFSET (button id differs from its command), a CIRCLE dropdown,
+    /// LAYERS (a non-command event). View: ZOOM EXTENTS and a second OFFSET.
+    fn ribbon() -> Ribbon {
+        let mut layers = tool("LAYERS", "");
+        layers.event = ModuleEvent::ToggleLayers;
+        let home = TestTab {
+            id: "home",
+            groups: vec![RibbonGroup {
+                title: "Modify",
+                tools: vec![
+                    RibbonItem::LargeTool(tool("OFFSET_TOOL", "OFFSET")),
+                    RibbonItem::Dropdown {
+                        id: "circle_dd",
+                        icon: IconKind::Glyph("o"),
+                        items: vec![
+                            ("CIRCLE", "Center, Radius", IconKind::Glyph("o")),
+                            ("CIRCLE_2P", "2-Point", IconKind::Glyph("o")),
+                        ],
+                        default: "CIRCLE",
+                    },
+                    RibbonItem::Tool(layers),
+                ],
+            }],
+        };
+        let view = TestTab {
+            id: "view",
+            groups: vec![RibbonGroup {
+                title: "Navigate",
+                tools: vec![
+                    RibbonItem::Tool(tool("ZOOM_EXTENTS", "ZOOM EXTENTS")),
+                    RibbonItem::Tool(tool("OFFSET_VIEW", "OFFSET")),
+                ],
+            }],
+        };
+        let mut ribbon = Ribbon::default();
+        ribbon.set_modules(vec![Box::new(home), Box::new(view)]);
+        ribbon
+    }
+
+    #[test]
+    fn a_command_lights_the_button_that_runs_it_not_one_named_like_it() {
+        let mut r = ribbon();
+        r.show_command("OFFSET");
+        assert_eq!(r.active_tool.as_deref(), Some("OFFSET_TOOL"));
+        assert_eq!(r.tab_holding_active_tool(), None);
+    }
+
+    #[test]
+    fn a_dropdown_item_is_keyed_on_its_command_so_the_dropdown_lights() {
+        let mut r = ribbon();
+        r.show_command("circle_2p");
+        assert_eq!(r.active_tool.as_deref(), Some("CIRCLE_2P"));
+    }
+
+    #[test]
+    fn a_button_on_another_tab_lights_that_tab() {
+        let mut r = ribbon();
+        r.show_command("ZOOM EXTENTS");
+        assert_eq!(r.active_tool.as_deref(), Some("ZOOM_EXTENTS"));
+        assert_eq!(r.tab_holding_active_tool(), Some(1));
+        r.select(1);
+        assert_eq!(r.tab_holding_active_tool(), None);
+    }
+
+    #[test]
+    fn a_command_on_two_tabs_prefers_the_tab_on_show_then_the_clicked_one() {
+        let mut r = ribbon();
+        r.select(1);
+        r.show_command("OFFSET");
+        assert_eq!(r.active_tool.as_deref(), Some("OFFSET_VIEW"));
+        // A clicked button keeps its highlight when its command dispatches,
+        // even though another button for the same command comes first.
+        r.select(0);
+        r.activate_tool("OFFSET_VIEW");
+        r.show_command("OFFSET");
+        assert_eq!(r.active_tool.as_deref(), Some("OFFSET_VIEW"));
+    }
+
+    #[test]
+    fn arguments_fall_back_to_the_bare_verb() {
+        let mut r = ribbon();
+        r.show_command("OFFSET 5");
+        assert_eq!(r.active_tool.as_deref(), Some("OFFSET_TOOL"));
+    }
+
+    #[test]
+    fn a_command_without_a_button_clears_the_previous_highlight() {
+        let mut r = ribbon();
+        r.show_command("OFFSET");
+        r.show_command("DIST");
+        assert_eq!(r.active_tool, None);
+        assert_eq!(r.tab_holding_active_tool(), None);
+        // A non-command button has no command line to match.
+        r.show_command("LAYERS");
+        assert_eq!(r.active_tool, None);
+    }
+
+    #[test]
+    fn slide_out_tools_and_their_options_belong_to_their_group() {
+        // The Draw group's title slide-out holds SPLINE; the Modify one holds
+        // the draw-order submenu.
+        let draw = RibbonGroup {
+            title: "Draw",
+            tools: vec![],
+        };
+        assert!(group_holds(&draw, "SPLINE"));
+        let modify = RibbonGroup {
+            title: "Modify",
+            tools: vec![],
+        };
+        assert!(group_holds(&modify, "DRAWORDER_BACK"));
+    }
+
+    #[test]
+    fn the_shipped_ribbon_resolves_its_own_commands() {
+        let mut r = Ribbon::default();
+        for cmd in ["LINE", "OFFSET", "SPLINE", "ZOOM EXTENTS"] {
+            r.show_command(cmd);
+            assert!(r.active_tool.is_some(), "{cmd} has no ribbon button");
+        }
+    }
+}

src/ui/ribbon/mod.rs

@@ -30,6 +30,7 @@ pub use context_tools::{pdf_underlay_tools, point_cloud_tools, xref_tools, Under
 use widgets::{StyleContext, *};
 pub(crate) use widgets::{REDO_HISTORY_ID, UNDO_HISTORY_ID};
 mod collapse;
+mod locate;
 use collapse::{CollapsePanels, Panel};
 pub use collapse::CollapseMode;
 use crate::ui::wrap_bar::{PosReport, WrapBar, WrapFlow};
@@ -303,6 +304,10 @@ impl Ribbon {
     pub fn activate_tool(&mut self, id: &str) {
         self.active_tool = Some(id.to_string());
     }
+    #[cfg(test)]
+    pub(crate) fn active_tool(&self) -> Option<&str> {
+        self.active_tool.as_deref()
+    }
     pub fn deactivate_tool(&mut self) {
         self.active_tool = None;
     }
@@ -516,6 +521,9 @@ impl Ribbon {
         // The quick-access flow and the tabs flow each flex-wrap; WrapBar stacks
         // them so a wrapped tab never shares a row with a quick-access button.
 
+        // A running command whose button is on another tab lights that tab's
+        // header in the button's own blue, pointing at where the button lives.
+        let holding_tab = self.tab_holding_active_tool();
         let tab_items = self.modules.iter().enumerate().fold(
             Vec::<Element<'_, Message>>::new(),
             |mut acc, (i, module)| {
@@ -527,6 +535,7 @@ impl Ribbon {
 
                 let is_active = i == self.active;
                 let is_contextual = module.id() == "layout";
+                let holds_tool = holding_tab == Some(i);
                 let btn = container(
                     button(text(crate::i18n::ribbon_module_title(module.id(), module.title())).size(12))
                         .on_press(Message::RibbonSelectTab(i))
@@ -539,6 +548,7 @@ impl Ribbon {
                             };
                             let pair = match (is_active, status) {
                                 (true, _) => palette.background.weakest,
+                                (false, _) if holds_tool => palette.primary.weak,
                                 (false, button::Status::Hovered) => {
                                     if is_contextual {
                                         palette.warning.weak
@@ -550,9 +560,10 @@ impl Ribbon {
                             };
                             button::Style {
                             background: (is_active
+                                || holds_tool
                                 || matches!(status, button::Status::Hovered))
                                 .then_some(Background::Color(pair.color)),
-                            text_color: if is_active {
+                            text_color: if is_active || holds_tool {
                                 pair.text
                             } else if is_contextual {
                                 accent.color
@@ -1414,6 +1425,7 @@ fn render_group<'a>(
             group.title,
             &group.tools.iter().filter_map(item_id).collect::<Vec<_>>(),
             open_dd,
+            active_tool.as_deref(),
         ),
     ]
     .align_x(iced::Center)
@@ -1495,6 +1507,19 @@ fn collapse_button<'a>(
 ) -> Element<'a, Message> {
     let title = group.title;
     let localized_title = t!(title).into_owned();
+    // A collapsed panel lights its opener while one of its hidden tools runs,
+    // the way a dropdown lights while one of its items does.
+    let active = active_tool.as_deref();
+    let holds = active.is_some_and(|id| locate::group_holds(group, id));
+    let opener_style = move |lit: bool| {
+        move |theme: &Theme, status| {
+            if lit {
+                tool_btn_style(theme, true, status)
+            } else {
+                button::subtle(theme, status)
+            }
+        }
+    };
 
     // Tightest form: one button = the panel's FIRST tool icon + its title + ▾.
     // Clicking opens the flyout listing every tool; no tool runs directly at this
@@ -1525,7 +1550,7 @@ fn collapse_button<'a>(
             .width(Fill),
         )
         .on_press(Message::ToggleRibbonPanel(title.to_string()))
-        .style(button::subtle)
+        .style(opener_style(holds))
         .width(Fill)
         .padding([3, 5]);
         return automatic_large_button(localized_title, content.into());
@@ -1535,6 +1560,8 @@ fn collapse_button<'a>(
     // that runs the last-used tool — above a title + ▾ opener for the full flyout.
     // For a Properties panel the representative is its Match button.
     let rep = representative(group, last_used);
+    // The face lights itself when it is the running tool.
+    let face_lit = rep.zip(active).is_some_and(|(item, id)| locate::item_holds(item, id));
     let face: Element<'_, Message> = match rep {
         Some(RibbonItem::PropertiesGroup { match_prop }) => {
             render_large(
@@ -1590,7 +1617,7 @@ fn collapse_button<'a>(
         .align_y(iced::Center),
     )
     .on_press(Message::ToggleRibbonPanel(title.to_string()))
-    .style(button::subtle)
+    .style(opener_style(holds && !face_lit))
     .width(Fill)
     .padding([1, 4]);
     let opener = automatic_large_button(localized_title, opener.into());