diff --git a/locales/ar-SA/opencadstudio.ftl b/locales/ar-SA/opencadstudio.ftl
index 58d54f9a0..a30573a1c 100644
--- a/locales/ar-SA/opencadstudio.ftl
+++ b/locales/ar-SA/opencadstudio.ftl
@@ -6485,6 +6485,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = إضافة إلى مجموعة العمل
     .remove-from-working-set = إزالة من مجموعة العمل
     .toolbar-objects = كائنات
diff --git a/locales/bg-BG/opencadstudio.ftl b/locales/bg-BG/opencadstudio.ftl
index acb1ac860..4d36dc851 100644
--- a/locales/bg-BG/opencadstudio.ftl
+++ b/locales/bg-BG/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Добави към работния набор
     .remove-from-working-set = Премахни от работния набор
     .toolbar-objects = обекта
diff --git a/locales/cs-CZ/opencadstudio.ftl b/locales/cs-CZ/opencadstudio.ftl
index c6f6151c8..e36c18500 100644
--- a/locales/cs-CZ/opencadstudio.ftl
+++ b/locales/cs-CZ/opencadstudio.ftl
@@ -6470,6 +6470,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Přidat do pracovní sady
     .remove-from-working-set = Odebrat z pracovní sady
     .toolbar-objects = objektů
diff --git a/locales/de-DE/opencadstudio.ftl b/locales/de-DE/opencadstudio.ftl
index 9686e0aaf..2e19397ff 100644
--- a/locales/de-DE/opencadstudio.ftl
+++ b/locales/de-DE/opencadstudio.ftl
@@ -6471,6 +6471,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Zum Arbeitssatz hinzufügen
     .remove-from-working-set = Aus dem Arbeitssatz entfernen
     .toolbar-objects = Objekte
diff --git a/locales/el-GR/opencadstudio.ftl b/locales/el-GR/opencadstudio.ftl
index 26eca339a..1947fcb4a 100644
--- a/locales/el-GR/opencadstudio.ftl
+++ b/locales/el-GR/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Προσθήκη στο σύνολο εργασίας
     .remove-from-working-set = Αφαίρεση από το σύνολο εργασίας
     .toolbar-objects = αντικείμενα
diff --git a/locales/en-US/opencadstudio.ftl b/locales/en-US/opencadstudio.ftl
index 0f4734280..7afea647c 100644
--- a/locales/en-US/opencadstudio.ftl
+++ b/locales/en-US/opencadstudio.ftl
@@ -6472,6 +6472,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Add to Working Set
     .remove-from-working-set = Remove from Working Set
     .toolbar-objects = objects
diff --git a/locales/es-ES/opencadstudio.ftl b/locales/es-ES/opencadstudio.ftl
index 4ae2ed045..9369dbb40 100644
--- a/locales/es-ES/opencadstudio.ftl
+++ b/locales/es-ES/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Añadir al conjunto de trabajo
     .remove-from-working-set = Eliminar del conjunto de trabajo
     .toolbar-objects = objetos
diff --git a/locales/fi-FI/opencadstudio.ftl b/locales/fi-FI/opencadstudio.ftl
index 950164de4..f3201449c 100644
--- a/locales/fi-FI/opencadstudio.ftl
+++ b/locales/fi-FI/opencadstudio.ftl
@@ -6470,6 +6470,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Lisää työjoukkoon
     .remove-from-working-set = Poista työjoukosta
     .toolbar-objects = objektia
diff --git a/locales/fr-FR/opencadstudio.ftl b/locales/fr-FR/opencadstudio.ftl
index 8b24070bd..c2645e706 100644
--- a/locales/fr-FR/opencadstudio.ftl
+++ b/locales/fr-FR/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Ajouter au jeu de travail
     .remove-from-working-set = Supprimer du jeu de travail
     .toolbar-objects = objets
diff --git a/locales/hi-IN/opencadstudio.ftl b/locales/hi-IN/opencadstudio.ftl
index 0aab05d14..8fcf188f5 100644
--- a/locales/hi-IN/opencadstudio.ftl
+++ b/locales/hi-IN/opencadstudio.ftl
@@ -6461,6 +6461,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = कार्य सेट में जोड़ें
     .remove-from-working-set = कार्य सेट से हटाएँ
     .toolbar-objects = ऑब्जेक्ट
diff --git a/locales/hu-HU/opencadstudio.ftl b/locales/hu-HU/opencadstudio.ftl
index 4565836cd..6af9ce6cf 100644
--- a/locales/hu-HU/opencadstudio.ftl
+++ b/locales/hu-HU/opencadstudio.ftl
@@ -6457,6 +6457,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Hozzáadás a munkakészlethez
     .remove-from-working-set = Eltávolítás a munkakészletből
     .toolbar-objects = objektum
diff --git a/locales/it-IT/opencadstudio.ftl b/locales/it-IT/opencadstudio.ftl
index 9f8ace95c..24d2da5ad 100644
--- a/locales/it-IT/opencadstudio.ftl
+++ b/locales/it-IT/opencadstudio.ftl
@@ -6472,6 +6472,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Aggiungi al gruppo di lavoro
     .remove-from-working-set = Rimuovi dal gruppo di lavoro
     .toolbar-objects = oggetti
diff --git a/locales/ja-JP/opencadstudio.ftl b/locales/ja-JP/opencadstudio.ftl
index 6703c8b44..af3c245a5 100644
--- a/locales/ja-JP/opencadstudio.ftl
+++ b/locales/ja-JP/opencadstudio.ftl
@@ -6461,6 +6461,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = 作業セットに追加
     .remove-from-working-set = 作業セットから除去
     .toolbar-objects = 個のオブジェクト
diff --git a/locales/ko-KR/opencadstudio.ftl b/locales/ko-KR/opencadstudio.ftl
index b9bf8d88f..cb12d1b10 100644
--- a/locales/ko-KR/opencadstudio.ftl
+++ b/locales/ko-KR/opencadstudio.ftl
@@ -6472,6 +6472,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = 작업 세트에 추가
     .remove-from-working-set = 작업 세트에서 제거
     .toolbar-objects = 개 객체
diff --git a/locales/lo-LA/opencadstudio.ftl b/locales/lo-LA/opencadstudio.ftl
index 3fc078836..76691d11e 100644
--- a/locales/lo-LA/opencadstudio.ftl
+++ b/locales/lo-LA/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = ເພີ່ມໃສ່ຊຸດເຮັດວຽກ
     .remove-from-working-set = ລຶບອອກຈາກຊຸດເຮັດວຽກ
     .toolbar-objects = ວັດຖຸ
diff --git a/locales/nl-NL/opencadstudio.ftl b/locales/nl-NL/opencadstudio.ftl
index 1aba8d7c3..e17fa57ec 100644
--- a/locales/nl-NL/opencadstudio.ftl
+++ b/locales/nl-NL/opencadstudio.ftl
@@ -6471,6 +6471,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Toevoegen aan werkset
     .remove-from-working-set = Verwijderen uit werkset
     .toolbar-objects = objecten
diff --git a/locales/pl-PL/opencadstudio.ftl b/locales/pl-PL/opencadstudio.ftl
index 0aa504dcc..e7a5a49ac 100644
--- a/locales/pl-PL/opencadstudio.ftl
+++ b/locales/pl-PL/opencadstudio.ftl
@@ -6472,6 +6472,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Dodaj do zbioru roboczego
     .remove-from-working-set = Usuń ze zbioru roboczego
     .toolbar-objects = obiekty
diff --git a/locales/pt-BR/opencadstudio.ftl b/locales/pt-BR/opencadstudio.ftl
index d68f4385d..15be3e15c 100644
--- a/locales/pt-BR/opencadstudio.ftl
+++ b/locales/pt-BR/opencadstudio.ftl
@@ -6473,6 +6473,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Adicionar ao conjunto de trabalho
     .remove-from-working-set = Remover do conjunto de trabalho
     .toolbar-objects = objetos
diff --git a/locales/ru-RU/opencadstudio.ftl b/locales/ru-RU/opencadstudio.ftl
index 25f2d76cc..de93cb86d 100644
--- a/locales/ru-RU/opencadstudio.ftl
+++ b/locales/ru-RU/opencadstudio.ftl
@@ -6474,6 +6474,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = Добавить в рабочий набор
     .remove-from-working-set = Удалить из рабочего набора
     .toolbar-objects = объектов
diff --git a/locales/tr-TR/opencadstudio.ftl b/locales/tr-TR/opencadstudio.ftl
index da6152f3a..e493d5098 100644
--- a/locales/tr-TR/opencadstudio.ftl
+++ b/locales/tr-TR/opencadstudio.ftl
@@ -6394,6 +6394,9 @@ view-background =
     .select-image = Arka Plan Görüntüsü Seç
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ nesne eklendi
+    .use-refclose = Referans düzenleme oturumunu bitirmek için REFCLOSE komutunu veya referans düzenleme araç çubuğunu kullanın.
+    .opposite-corner = Karşı köşeyi belirtin:
     .add-to-working-set = Çalışma Kümesine Ekle
     .remove-from-working-set = Çalışma Kümesinden Çıkar
     .toolbar-objects = nesne
diff --git a/locales/zh-CN/opencadstudio.ftl b/locales/zh-CN/opencadstudio.ftl
index ea8690e95..fdefaae90 100644
--- a/locales/zh-CN/opencadstudio.ftl
+++ b/locales/zh-CN/opencadstudio.ftl
@@ -6456,6 +6456,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = 添加到工作集
     .remove-from-working-set = 从工作集删除
     .toolbar-objects = 个对象
diff --git a/locales/zh-TW/opencadstudio.ftl b/locales/zh-TW/opencadstudio.ftl
index aa43eb0bf..3f7e91475 100644
--- a/locales/zh-TW/opencadstudio.ftl
+++ b/locales/zh-TW/opencadstudio.ftl
@@ -6468,6 +6468,9 @@ view-background =
     .select-image = Select Background Image
 
 ref-edit =
+    .entities-added = __ocs_fmt_0__ entities added
+    .use-refclose = Use REFCLOSE or the Refedit toolbar to end reference editing session.
+    .opposite-corner = Specify opposite corner:
     .add-to-working-set = 加入工作集
     .remove-from-working-set = 從工作集移除
     .toolbar-objects = 個物件
diff --git a/src/app/commands/refedit.rs b/src/app/commands/refedit.rs
index 3c924187b..351a825fe 100644
--- a/src/app/commands/refedit.rs
+++ b/src/app/commands/refedit.rs
@@ -256,7 +256,7 @@ impl OpenCADStudio {
                         .map(|l| l.insert.value().to_string())
                         .collect();
                     return self.dispatch_command(&format!(
-                        "REFEDIT_BEGIN:{}:{}:{}::{}:{}",
+                        "REFEDIT_BEGIN:{}:{}:{}::{}:{}:1",
                         state.top.value(),
                         path.join(","),
                         attributes as u8,
@@ -293,6 +293,8 @@ impl OpenCADStudio {
         let unique = parts
             .next()
             .map_or(self.refedit_options.unique_names, |v| v == "1");
+        // Opened from the Reference Edit dialog (REFEDIT, not -REFEDIT).
+        let from_dialog = parts.next() == Some("1");
         if self.tabs[i].refedit_session.is_some() || self.reject_locked_edit(i, top) {
             return;
         }
@@ -396,6 +398,19 @@ impl OpenCADStudio {
         self.tabs[i].scene.refedit_lock = lock;
         self.tabs[i].scene.deselect_all();
         self.tabs[i].dirty = true;
+        if from_dialog {
+            match nested.len() {
+                0 => {}
+                1 => self.command_line.push_output(crate::t!("1 item selected").as_ref()),
+                n => self
+                    .command_line
+                    .push_output(crate::tf!("{} items selected", n).as_ref()),
+            }
+            self.command_line.push_output(
+                crate::t!("Use REFCLOSE or the Refedit toolbar to end reference editing session.")
+                    .as_ref(),
+            );
+        }
         // No active command — the definition's objects are edited freely
         // (move, grips, draw, erase…) until REFCLOSE.
         self.tabs[i].active_cmd = None;
diff --git a/src/locale_catalog.rs b/src/locale_catalog.rs
index 3d578321d..7c2808177 100644
--- a/src/locale_catalog.rs
+++ b/src/locale_catalog.rs
@@ -3,6 +3,9 @@
 
 pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static str)> {
     match source {
+        "{} entities added" => Some(("ref-edit", "entities-added")),
+        "Use REFCLOSE or the Refedit toolbar to end reference editing session." => Some(("ref-edit", "use-refclose")),
+        "Specify opposite corner:" => Some(("ref-edit", "opposite-corner")),
         "Add to Working Set" => Some(("ref-edit", "add-to-working-set")),
         "Remove from Working Set" => Some(("ref-edit", "remove-from-working-set")),
         "Select reference:" => Some(("ref-edit", "select-reference")),
diff --git a/src/modules/draw/modify/refedit.rs b/src/modules/draw/modify/refedit.rs
index b1d25e969..918451570 100644
--- a/src/modules/draw/modify/refedit.rs
+++ b/src/modules/draw/modify/refedit.rs
@@ -414,6 +414,8 @@ pub struct RefEditOptionsCommand {
     /// Set when the Edit Reference dialog already chose the attribute
     /// option: the nested pick then opens the session directly.
     attributes: Option<bool>,
+    /// First corner of a window started by a pick on empty space.
+    corner: Option<DVec3>,
 }
 
 impl RefEditOptionsCommand {
@@ -435,6 +437,7 @@ impl RefEditOptionsCommand {
             lock,
             unique,
             attributes: None,
+            corner: None,
         }
     }
 
@@ -464,34 +467,81 @@ impl RefEditOptionsCommand {
         let nested: Vec<String> = self.nested.iter().map(|h| h.value().to_string()).collect();
         CmdResult::Relaunch(
             format!(
-                "REFEDIT_BEGIN:{}:{}:{}:{}:{}:{}",
+                "REFEDIT_BEGIN:{}:{}:{}:{}:{}:{}:{}",
                 self.top.value(),
                 path.join(","),
                 attributes as u8,
                 nested.join(","),
                 self.lock as u8,
-                self.unique as u8
+                self.unique as u8,
+                self.attributes.is_some() as u8
             ),
             vec![],
         )
     }
 
-    fn pick_nested(&mut self, point: DVec3) -> CmdResult {
+    /// A pick at `point`: the nearest object of the level within `tolerance`
+    /// (any distance when None), else the first corner of a window.
+    fn pick_nested(&mut self, point: DVec3, tolerance: Option<f64>) -> CmdResult {
+        if let Some(first) = self.corner.take() {
+            return self.window_nested(first, point);
+        }
         let nearest = self
             .hits
             .get(self.level)
             .into_iter()
             .flatten()
             .filter_map(|(h, paths)| paths_distance(paths, point).map(|d| (*h, d)))
+            .filter(|(_, d)| tolerance.is_none_or(|t| *d <= t))
             .min_by(|a, b| a.1.total_cmp(&b.1));
         match nearest {
-            Some((h, _)) if !self.nested.contains(&h) => {
-                self.nested.push(h);
-                CmdResult::ReportMeasurement(t!("1 entity added").into_owned())
+            Some((h, _)) => {
+                let added = !self.nested.contains(&h);
+                if added {
+                    self.nested.push(h);
+                }
+                CmdResult::ReportMeasurement(entities_added(added as usize))
+            }
+            None => {
+                self.corner = Some(point);
+                CmdResult::NeedPoint
             }
-            _ => CmdResult::NeedPoint,
         }
     }
+
+    /// The level's objects in the window from `first` to `second`: wholly
+    /// inside when it was dragged to the right, touching it when to the left.
+    fn window_nested(&mut self, first: DVec3, second: DVec3) -> CmdResult {
+        let (lo, hi) = (first.min(second), first.max(second));
+        let crossing = second.x < first.x;
+        let inside = |p: &[f64; 3]| p[0] >= lo.x && p[0] <= hi.x && p[1] >= lo.y && p[1] <= hi.y;
+        let picked: Vec<Handle> = self
+            .hits
+            .get(self.level)
+            .into_iter()
+            .flatten()
+            .filter(|(_, paths)| {
+                let points = || paths.iter().flatten();
+                if crossing {
+                    points().any(inside)
+                        || paths.iter().any(|path| {
+                            path.windows(2).any(|s| segment_meets_box(s[0], s[1], lo, hi))
+                        })
+                } else {
+                    points().next().is_some() && points().all(inside)
+                }
+            })
+            .map(|(h, _)| *h)
+            .collect();
+        let mut added = 0;
+        for h in picked {
+            if !self.nested.contains(&h) {
+                self.nested.push(h);
+                added += 1;
+            }
+        }
+        CmdResult::ReportMeasurement(entities_added(added))
+    }
 }
 
 impl CadCommand for RefEditOptionsCommand {
@@ -504,6 +554,9 @@ impl CadCommand for RefEditOptionsCommand {
             OptionStep::Method => {
                 t!("Enter object selection method [All/Nested] <All>:").into_owned()
             }
+            OptionStep::Nested if self.corner.is_some() => {
+                t!("Specify opposite corner:").into_owned()
+            }
             OptionStep::Nested => t!("Select nested objects:").into_owned(),
             OptionStep::Attributes => {
                 t!("Display attribute definitions [Yes/No] <No>:").into_owned()
@@ -526,8 +579,13 @@ impl CadCommand for RefEditOptionsCommand {
     fn needs_entity_pick(&self) -> bool {
         matches!(self.step, OptionStep::Nested)
     }
-    fn on_entity_pick(&mut self, _handle: Handle, pt: DVec3) -> CmdResult {
-        self.pick_nested(pt)
+    fn on_entity_pick(&mut self, handle: Handle, pt: DVec3) -> CmdResult {
+        // A click on empty space starts a window, as does one beside the
+        // reference's objects.
+        if handle.is_null() {
+            return self.pick_nested(pt, Some(0.0));
+        }
+        self.pick_nested(pt, None)
     }
     fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
         let word = text.trim().to_ascii_uppercase();
@@ -554,7 +612,8 @@ impl CadCommand for RefEditOptionsCommand {
     }
     fn on_point(&mut self, pt: DVec3) -> CmdResult {
         match self.step {
-            OptionStep::Nested => self.pick_nested(pt),
+            // A typed point picks the object it lies on.
+            OptionStep::Nested => self.pick_nested(pt, Some(1e-6 * pt.length().max(1.0))),
             _ => CmdResult::NeedPoint,
         }
     }
@@ -573,12 +632,14 @@ impl CadCommand for RefEditOptionsCommand {
                 self.step = OptionStep::Attributes;
                 CmdResult::NeedPoint
             }
+            OptionStep::Nested if self.corner.take().is_some() => CmdResult::NeedPoint,
             OptionStep::Nested => {
                 let n = self.nested.len();
                 if n == 0 {
                     return CmdResult::CancelWithMessage(t!("0 items selected").into_owned());
                 }
                 if let Some(attributes) = self.attributes {
+                    // The count and the session's note follow as it opens.
                     return self.begin(attributes);
                 }
                 self.step = OptionStep::Attributes;
@@ -593,6 +654,45 @@ impl CadCommand for RefEditOptionsCommand {
     }
 }
 
+/// `N entity added` / `N entities added`.
+fn entities_added(n: usize) -> String {
+    if n == 1 {
+        t!("1 entity added").into_owned()
+    } else {
+        crate::tf!("{} entities added", n).into_owned()
+    }
+}
+
+/// Whether the segment from `a` to `b` crosses the box `lo`..`hi` (XY).
+fn segment_meets_box(a: [f64; 3], b: [f64; 3], lo: DVec3, hi: DVec3) -> bool {
+    // Liang–Barsky clip of the segment against the box.
+    let (mut t0, mut t1) = (0.0f64, 1.0f64);
+    let d = [b[0] - a[0], b[1] - a[1]];
+    for (p, q) in [
+        (-d[0], a[0] - lo.x),
+        (d[0], hi.x - a[0]),
+        (-d[1], a[1] - lo.y),
+        (d[1], hi.y - a[1]),
+    ] {
+        if p == 0.0 {
+            if q < 0.0 {
+                return false;
+            }
+        } else {
+            let r = q / p;
+            if p < 0.0 {
+                t0 = t0.max(r);
+            } else {
+                t1 = t1.min(r);
+            }
+            if t0 > t1 {
+                return false;
+            }
+        }
+    }
+    true
+}
+
 // ── REFSET ────────────────────────────────────────────────────────────────
 
 /// `Enter an option [Add/Remove] <Add>:` then `Select objects:`.