G4: Optical margin menu uses shared text flag

Squashed from #4309 onto main.

crates/ui-egui/src/menus/state.rs

@@ -40,8 +40,7 @@ pub fn checked(app: &VectorcraftApp, id: &str, p: &Value) -> Option<bool> {
         "type.orientation.vertical" | "type.orientation.horizontal" => {
             selected_text(false).is_some_and(|t| t.vertical == (id == "type.orientation.vertical"))
         }
-        // Checked when the first type object `selected_text` finds has it on.
-        "type.opticalMarginAlignment" => selected_text(false).is_some_and(|t| t.optical_margin),
+        "type.opticalMarginAlignment" => crate::panels::character::shared_text_flag(app, |t| t.optical_margin) == Some(true),
         "view.outline" => v.outline,
         "view.pixelPreview" => v.pixel_preview,
         "view.trimView" => v.trim_view,

crates/ui-egui/src/menus/tests.rs

@@ -239,6 +239,22 @@ fn optical_margin_alignment_is_a_checked_type_menu_item() {
     assert_eq!(checked(&app, "type.orientation.horizontal", &Value::Null), Some(false));
 }
 
+/// Type › Optical Margin Alignment menu check uses `shared_text_flag`; mixed values stay unchecked.
+#[test]
+fn optical_margin_alignment_menu_unchecked_when_shared_flag_none() {
+    let mut app = VectorcraftApp::new(vectorcraft_engine::Session::new(), crate::Services::default());
+    app.run("file.new", json!({})).unwrap();
+    let off = app.run("text.create", json!({"x": 10, "y": 40, "text": "Off"})).unwrap()["id"].clone();
+    let on = app.run("text.create", json!({"x": 10, "y": 80, "text": "On"})).unwrap()["id"].clone();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": on})).unwrap();
+    app.run("select.set", json!({"ids": [off, on]})).unwrap();
+    let id = "type.opticalMarginAlignment";
+    assert_eq!(crate::panels::character::shared_text_flag(&app, |t| t.optical_margin), None);
+    assert_eq!(checked(&app, id, &Value::Null), Some(false));
+    app.run("select.set", json!({"ids": [on]})).unwrap();
+    assert_eq!(checked(&app, id, &Value::Null), Some(true));
+}
+
 #[test]
 fn panel_ids_are_case_insensitive_and_labels_work() {
     assert_eq!(normalize_panel("layers"), Some("layers"));

crates/ui-egui/src/panels/character.rs

@@ -54,6 +54,38 @@ pub(crate) fn first_selected_text(app: &VectorcraftApp) -> Option<&vectorcraft_d
     None
 }
 
+/// A boolean on every selected text object (`Some(true)` / `Some(false)`), or `None` when they
+/// differ. When the Type tool edits text, only that object counts.
+pub(crate) fn shared_text_flag(app: &VectorcraftApp, f: impl Fn(&vectorcraft_doc::TextObject) -> bool) -> Option<bool> {
+    if let Some((id, _, _)) = text_editing(app) {
+        return app.session.active().and_then(|st| st.doc.node(id)).and_then(|n| match &n.kind {
+            NodeKind::Text(t) => Some(f(t)),
+            _ => None,
+        });
+    }
+    let st = app.session.active()?;
+    let mut value: Option<bool> = None;
+    let mut mixed = false;
+    let mut saw = false;
+    for node in st.selection.objects.iter().filter_map(|id| st.doc.node(*id)) {
+        node.walk(&mut |n| {
+            if let NodeKind::Text(t) = &n.kind {
+                saw = true;
+                if mixed {
+                    return;
+                }
+                let v = f(t);
+                match value {
+                    None => value = Some(v),
+                    Some(a) if a == v => {}
+                    Some(_) => mixed = true,
+                }
+            }
+        });
+    }
+    if !saw || mixed { None } else { value }
+}
+
 /// `f` of the character styles the panels act on: the runs the Type tool's selection covers (the
 /// caret's style at a caret), else every run of the selected type, groups' included. `None` (a
 /// blank field) where they differ, or with no type.

crates/ui-egui/src/panels/character/tests.rs

@@ -488,6 +488,30 @@ fn character_direction_checks_the_direction_of_the_selection() {
     assert_eq!(checked(&mut app), ["Default"]);
 }
 
+#[test]
+fn shared_text_flag_optical_margin_three_object_selections() {
+    let mut app = VectorcraftApp::new(Session::new(), Default::default());
+    app.run("file.new", json!({})).unwrap();
+    let a = app.run("text.create", json!({"x": 10, "y": 40, "text": "a"})).unwrap()["id"].clone();
+    let b = app.run("text.create", json!({"x": 10, "y": 80, "text": "b"})).unwrap()["id"].clone();
+    let c = app.run("text.create", json!({"x": 10, "y": 120, "text": "c"})).unwrap()["id"].clone();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": a})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": false, "id": b})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": false, "id": c})).unwrap();
+    app.run("select.set", json!({"ids": [a.clone(), b.clone(), c.clone()]})).unwrap();
+    assert_eq!(shared_text_flag(&app, |t| t.optical_margin), None);
+    app.run("type.opticalMarginAlignment", json!({"on": false, "id": a})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": b})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": c})).unwrap();
+    app.run("select.set", json!({"ids": [a.clone(), b.clone(), c.clone()]})).unwrap();
+    assert_eq!(shared_text_flag(&app, |t| t.optical_margin), None);
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": a})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": b})).unwrap();
+    app.run("type.opticalMarginAlignment", json!({"on": true, "id": c})).unwrap();
+    app.run("select.set", json!({"ids": [a, b, c]})).unwrap();
+    assert_eq!(shared_text_flag(&app, |t| t.optical_margin), Some(true));
+}
+
 /// Small Caps, Superscript and Subscript buttons and menu items stay off when the selection mixes them.
 #[test]
 fn character_mixed_small_caps_and_position_show_off() {