Fix #3724: Window > New Window is greyed out until it opens a window

New Window was enabled in the menus and in the control channel's menu
listing, but choosing it opened nothing and answered with the internal
note "multiple windows land with M11.5". It is now disabled, as Window >
Arrange's unimplemented items already are, and a direct call fails with
a message meant for the user, translated in every catalog.

crates/ui-egui/src/i18n/bg.tsv

@@ -3957,7 +3957,7 @@ axis	Both	И двете
 @msg	missing index	липсва индекс
 @msg	missing number `{key}`	липсва число `{key}`
 @msg	missing integer `{key}`	липсва цяло число `{key}`
-@msg	multiple windows land with M11.5	множество прозорци се зареждат с M11.5
+@msg	New Window isn't available yet: a document opens in one window	Нов прозорец още не е наличен: документът се отваря в един прозорец
 @msg	name the file	именувайте файла
 @msg	no CSS to copy: select objects with CSS of their own	няма CSS за копиране: изберете обекти със собствен CSS
 @msg	no Live Paint edge near that point	няма ръб за интерактивно оцветяване близо до тази точка

crates/ui-egui/src/i18n/cs.tsv

@@ -4350,7 +4350,7 @@ imageTrace	Outline	Obrys
 @msg	missing index	chybí index
 @msg	missing number `{key}`	chybí číslo `{key}`
 @msg	missing integer `{key}`	chybí celé číslo `{key}`
-@msg	multiple windows land with M11.5	více oken přijde s M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nové okno zatím není k dispozici: dokument se otevírá v jednom okně
 @msg	name the file	pojmenujte soubor
 @msg	no CSS to copy: select objects with CSS of their own	žádné CSS ke kopírování: vyberte objekty s vlastním CSS
 @msg	no Live Paint edge near that point	poblíž tohoto bodu není žádná hrana živé malby

crates/ui-egui/src/i18n/da.tsv

@@ -4069,7 +4069,7 @@ imageTrace	Outline	Kontur
 @msg	missing index	indeks mangler
 @msg	missing number `{key}`	tallet `{key}` mangler
 @msg	missing integer `{key}`	heltallet `{key}` mangler
-@msg	multiple windows land with M11.5	flere vinduer lander med M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nyt vindue er ikke tilgængeligt endnu: et dokument åbnes i ét vindue
 @msg	name the file	giv filen et navn
 @msg	no CSS to copy: select objects with CSS of their own	ingen CSS at kopiere: markér objekter med deres egen CSS
 @msg	no Live Paint edge near that point	ingen Live Paint-kant i nærheden af det punkt

crates/ui-egui/src/i18n/de.tsv

@@ -3971,7 +3971,7 @@ theme	Appearance	Erscheinungsbild
 @msg	missing index	der Index fehlt
 @msg	missing number `{key}`	die Zahl `{key}` fehlt
 @msg	missing integer `{key}`	die ganze Zahl `{key}` fehlt
-@msg	multiple windows land with M11.5	mehrere Fenster kommen mit M11.5
+@msg	New Window isn't available yet: a document opens in one window	Neues Fenster ist noch nicht verfügbar: ein Dokument öffnet sich in einem Fenster
 @msg	name the file	benennen Sie die Datei
 @msg	no CSS to copy: select objects with CSS of their own	kein CSS zum Kopieren: Wählen Sie Objekte mit eigenem CSS aus
 @msg	no Live Paint edge near that point	keine Interaktiv-malen-Kante in der Nähe dieses Punkts

crates/ui-egui/src/i18n/el.tsv

@@ -4026,7 +4026,7 @@ theme	Appearance	Εμφάνιση
 @msg	missing index	λείπει ο δείκτης
 @msg	missing number `{key}`	λείπει ο αριθμός `{key}`
 @msg	missing integer `{key}`	λείπει ο ακέραιος `{key}`
-@msg	multiple windows land with M11.5	τα πολλαπλά παράθυρα θα προστεθούν στην έκδοση M11.5
+@msg	New Window isn't available yet: a document opens in one window	Το Νέο παράθυρο δεν είναι ακόμη διαθέσιμο: ένα έγγραφο ανοίγει σε ένα παράθυρο
 @msg	name the file	δώστε όνομα στο αρχείο
 @msg	no CSS to copy: select objects with CSS of their own	δεν υπάρχει CSS για αντιγραφή: επιλέξτε αντικείμενα με δικό τους CSS
 @msg	no Live Paint edge near that point	δεν υπάρχει ακμή δυναμικής βαφής κοντά σε αυτό το σημείο

crates/ui-egui/src/i18n/es.tsv

@@ -4047,7 +4047,7 @@ axis	Both	Ambos
 @msg	missing index	falta index
 @msg	missing number `{key}`	falta el número `{key}`
 @msg	missing integer `{key}`	falta el número entero `{key}`
-@msg	multiple windows land with M11.5	las ventanas múltiples llegan con M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nueva ventana aún no está disponible: un documento se abre en una sola ventana
 @msg	name the file	ponle nombre al archivo
 @msg	no CSS to copy: select objects with CSS of their own	no hay CSS que copiar: selecciona objetos con CSS propio
 @msg	no Live Paint edge near that point	no hay ningún borde de pintura interactiva cerca de ese punto

crates/ui-egui/src/i18n/fi.tsv

@@ -4263,7 +4263,7 @@ imageTrace	Outline	Ääriviiva
 @msg	missing index	indeksi puuttuu
 @msg	missing number `{key}`	luku `{key}` puuttuu
 @msg	missing integer `{key}`	kokonaisluku `{key}` puuttuu
-@msg	multiple windows land with M11.5	useat ikkunat tulevat versiossa M11.5
+@msg	New Window isn't available yet: a document opens in one window	Uusi ikkuna ei ole vielä käytettävissä: asiakirja avautuu yhteen ikkunaan
 @msg	name the file	anna tiedostolle nimi
 @msg	no CSS to copy: select objects with CSS of their own	ei kopioitavaa CSS:ää: valitse objekteja, joilla on oma CSS
 @msg	no Live Paint edge near that point	pisteen lähellä ei ole elävän maalauksen reunaa

crates/ui-egui/src/i18n/fr.tsv

@@ -4044,7 +4044,7 @@ axis	Both	Les deux
 @msg	missing index	index manquant
 @msg	missing number `{key}`	nombre `{key}` manquant
 @msg	missing integer `{key}`	nombre entier `{key}` manquant
-@msg	multiple windows land with M11.5	les fenêtres multiples arrivent avec M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nouvelle fenêtre n’est pas encore disponible : un document s’ouvre dans une seule fenêtre
 @msg	name the file	nommez le fichier
 @msg	no CSS to copy: select objects with CSS of their own	aucun CSS à copier : sélectionnez des objets ayant leur propre CSS
 @msg	no Live Paint edge near that point	aucun bord de peinture dynamique près de ce point

crates/ui-egui/src/i18n/hu.tsv

@@ -4710,7 +4710,7 @@ imageTrace	Outline	Körvonal
 @msg	move requires a destination panel	az áthelyezéshez célpanel kell
 @msg	move requires an existing destination panel	az áthelyezéshez létező célpanel kell
 @msg	Multichannel PSD files can't be read: save it in RGB, CMYK or Grayscale mode	a többcsatornás PSD-fájlok nem olvashatók: mentsd RGB, CMYK vagy szürkeárnyalatos módban
-@msg	multiple windows land with M11.5	a több ablak az M11.5 mérföldkőben érkezik
+@msg	New Window isn't available yet: a document opens in one window	Az Új ablak még nem érhető el: egy dokumentum egy ablakban nyílik meg
 @msg	name the file	adj nevet a fájlnak
 @msg	no active document	nincs aktív dokumentum
 @msg	no active perspective plane	nincs aktív perspektivikus sík

crates/ui-egui/src/i18n/id.tsv

@@ -4069,7 +4069,7 @@ imageTrace	Outline	Kontur
 @msg	missing index	indeks tidak ada
 @msg	missing number `{key}`	angka `{key}` tidak ada
 @msg	missing integer `{key}`	bilangan bulat `{key}` tidak ada
-@msg	multiple windows land with M11.5	beberapa jendela hadir bersama M11.5
+@msg	New Window isn't available yet: a document opens in one window	Jendela baru belum tersedia: dokumen dibuka dalam satu jendela
 @msg	name the file	beri nama file
 @msg	no CSS to copy: select objects with CSS of their own	tidak ada CSS untuk disalin: pilih objek yang memiliki CSS sendiri
 @msg	no Live Paint edge near that point	tidak ada tepi Live Paint di dekat titik itu

crates/ui-egui/src/i18n/it.tsv

@@ -4087,7 +4087,7 @@ axis	Both	Entrambi
 @msg	missing index	manca index
 @msg	missing number `{key}`	manca il numero `{key}`
 @msg	missing integer `{key}`	manca il numero intero `{key}`
-@msg	multiple windows land with M11.5	le finestre multiple arriveranno con M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nuova finestra non è ancora disponibile: un documento si apre in una sola finestra
 @msg	name the file	assegna un nome al file
 @msg	no CSS to copy: select objects with CSS of their own	nessun CSS da copiare: seleziona oggetti con un CSS proprio
 @msg	no Live Paint edge near that point	nessun bordo di pittura dinamica vicino a quel punto

crates/ui-egui/src/i18n/ja.tsv

@@ -4447,7 +4447,7 @@ swatch	Bright Violet	ビビッドバイオレット
 @msg	missing index	index が指定されていません
 @msg	missing number `{key}`	数値 `{key}` が指定されていません
 @msg	missing integer `{key}`	整数 `{key}` が指定されていません
-@msg	multiple windows land with M11.5	複数ウィンドウは M11.5 で対応予定です
+@msg	New Window isn't available yet: a document opens in one window	新規ウィンドウはまだ使用できません: ドキュメントは 1 つのウィンドウで開きます
 @msg	no PNG encoder	PNG エンコーダーがありません
 @msg	no document open	ドキュメントが開かれていません
 @msg	no effect applied yet	まだ効果を適用していません

crates/ui-egui/src/i18n/ka.tsv

@@ -3828,7 +3828,7 @@ font-technology	Variable	ცვლადი
 @msg	missing `name`	აკლია `name`
 @msg	missing `tool`	აკლია `tool`
 @msg	missing index	ინდექსი აკლია
-@msg	multiple windows land with M11.5	რამდენიმე ფანჯარა M11.5-ში დაემატება
+@msg	New Window isn't available yet: a document opens in one window	ახალი ფანჯარა ჯერ მიუწვდომელია: დოკუმენტი ერთ ფანჯარაში იხსნება
 @msg	name the file	მიუთითეთ ფაილის სახელი
 @msg	no CSS to copy: select objects with CSS of their own	კოპირებისთვის CSS არ არის: მონიშნეთ საკუთარი CSS-ის მქონე ობიექტები
 @msg	no Live Paint edge near that point	ამ წერტილთან ცოცხალი შეღებვის კიდე არ არის

crates/ui-egui/src/i18n/ko.tsv

@@ -4379,7 +4379,7 @@ theme	Appearance	외관
 @msg	missing index	index가 없습니다
 @msg	missing number `{key}`	숫자 `{key}`이(가) 없습니다
 @msg	missing integer `{key}`	정수 `{key}`이(가) 없습니다
-@msg	multiple windows land with M11.5	여러 창은 M11.5에서 지원됩니다
+@msg	New Window isn't available yet: a document opens in one window	새 창은 아직 사용할 수 없습니다: 문서는 하나의 창에서 열립니다
 @msg	no PNG encoder	PNG 인코더가 없습니다
 @msg	no document open	열린 문서가 없습니다
 @msg	no effect applied yet	아직 적용된 효과가 없습니다

crates/ui-egui/src/i18n/nl.tsv

@@ -4081,7 +4081,7 @@ imageTrace	Outline	Contour
 @msg	missing `name`	`name` ontbreekt
 @msg	missing `tool`	`tool` ontbreekt
 @msg	missing index	index ontbreekt
-@msg	multiple windows land with M11.5	meerdere vensters komen binnen met M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nieuw venster is nog niet beschikbaar: een document opent in één venster
 @msg	name the file	geef het bestand een naam
 @msg	no CSS to copy: select objects with CSS of their own	geen CSS om te kopiëren: selecteer objecten met eigen CSS
 @msg	no Live Paint edge near that point	geen Live Paint-rand bij dat punt

crates/ui-egui/src/i18n/pl.tsv

@@ -4172,7 +4172,7 @@ imageTrace	Outline	Kontur
 @msg	missing index	brak indeksu
 @msg	missing number `{key}`	brak liczby `{key}`
 @msg	missing integer `{key}`	brak liczby całkowitej `{key}`
-@msg	multiple windows land with M11.5	wiele okien pojawi się w M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nowe okno nie jest jeszcze dostępne: dokument otwiera się w jednym oknie
 @msg	name the file	nadaj nazwę plikowi
 @msg	no CSS to copy: select objects with CSS of their own	brak CSS do skopiowania: zaznacz obiekty z własnym CSS
 @msg	no Live Paint edge near that point	brak krawędzi aktywnego malowania w pobliżu tego punktu

crates/ui-egui/src/i18n/pt-br.tsv

@@ -3622,7 +3622,7 @@ axis	Both	Ambos
 @msg	missing index	falta o índice
 @msg	missing number `{key}`	falta o número `{key}`
 @msg	missing integer `{key}`	falta o número inteiro `{key}`
-@msg	multiple windows land with M11.5	várias janelas chegam com o M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nova Janela ainda não está disponível: um documento abre em uma única janela
 @msg	name the file	dê um nome ao arquivo
 @msg	no CSS to copy: select objects with CSS of their own	não há CSS para copiar: selecione objetos que tenham CSS próprio
 @msg	no Live Paint edge near that point	nenhuma aresta de Pintura dinâmica perto desse ponto

crates/ui-egui/src/i18n/ru.tsv

@@ -4083,7 +4083,7 @@ axis	Both	Оба
 @msg	missing index	отсутствует index
 @msg	missing number `{key}`	отсутствует число `{key}`
 @msg	missing integer `{key}`	отсутствует целое число `{key}`
-@msg	multiple windows land with M11.5	несколько окон появятся в M11.5
+@msg	New Window isn't available yet: a document opens in one window	Новое окно пока недоступно: документ открывается в одном окне
 @msg	name the file	дайте файлу имя
 @msg	no CSS to copy: select objects with CSS of their own	нет CSS для копирования: выделите объекты с собственным CSS
 @msg	no Live Paint edge near that point	рядом с этой точкой нет границы быстрой заливки

crates/ui-egui/src/i18n/sv.tsv

@@ -3962,7 +3962,7 @@ axis	Both	Båda
 @msg	missing index	index saknas
 @msg	missing number `{key}`	talet `{key}` saknas
 @msg	missing integer `{key}`	heltalet `{key}` saknas
-@msg	multiple windows land with M11.5	flera fönster kommer med M11.5
+@msg	New Window isn't available yet: a document opens in one window	Nytt fönster är inte tillgängligt än: ett dokument öppnas i ett fönster
 @msg	name the file	namnge filen
 @msg	no CSS to copy: select objects with CSS of their own	ingen CSS att kopiera: markera objekt som har egen CSS
 @msg	no Live Paint edge near that point	ingen Live Paint-kant nära den punkten

crates/ui-egui/src/i18n/tr.tsv

@@ -3824,7 +3824,7 @@ axis	Both	Her İkisi
 @msg	missing `name`	"isim" eksik
 @msg	missing `tool`	'araç' eksik
 @msg	missing index	eksik dizin
-@msg	multiple windows land with M11.5	M11.5 ile birden fazla pencere açılır
+@msg	New Window isn't available yet: a document opens in one window	Yeni Pencere henüz kullanılamıyor: bir belge tek pencerede açılır
 @msg	name the file	dosyayı adlandırın
 @msg	no CSS to copy: select objects with CSS of their own	kopyalanacak CSS yok: kendilerine ait CSS'ye sahip nesneleri seçin
 @msg	no Live Paint edge near that point	bu noktanın yakınında Canlı Boyama kenarı yok

crates/ui-egui/src/i18n/uk.tsv

@@ -4071,7 +4071,7 @@ axis	Both	Обидві
 @msg	missing index	відсутня index
 @msg	missing number `{key}`	відсутнє число `{key}`
 @msg	missing integer `{key}`	відсутнє ціле число `{key}`
-@msg	multiple windows land with M11.5	кілька вікон з’являться в M11.5
+@msg	New Window isn't available yet: a document opens in one window	Нове вікно поки недоступне: документ відкривається в одному вікні
 @msg	name the file	дайте файлу ім’я
 @msg	no CSS to copy: select objects with CSS of their own	ні CSS для копіювання: виділіть об’єкти з власним CSS
 @msg	no Live Paint edge near that point	поряд з цією точкою немає межі швидкої заливки

crates/ui-egui/src/i18n/vi.tsv

@@ -4357,7 +4357,7 @@ theme	Appearance	Giao diện
 @msg	move requires a destination panel	move cần bảng đích
 @msg	move requires an existing destination panel	move cần bảng đích tồn tại
 @msg	Multichannel PSD files can't be read: save it in RGB, CMYK or Grayscale mode	Tệp PSD đa kênh không thể đọc: lưu ở chế độ RGB, CMYK hoặc Thang xám
-@msg	multiple windows land with M11.5	nhiều cửa sổ sẽ có trong M11.5
+@msg	New Window isn't available yet: a document opens in one window	Cửa sổ mới chưa khả dụng: tài liệu mở trong một cửa sổ
 @msg	name the file	hãy đặt tên tệp
 @msg	no active document	không có tài liệu đang hoạt động
 @msg	no active perspective plane	không có mặt phẳng phối cảnh đang hoạt động

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -4169,7 +4169,7 @@ imageTrace	Outline	轮廓
 @msg	missing `name`	缺少 `name`
 @msg	missing `tool`	缺少 `tool`
 @msg	missing index	缺少 index
-@msg	multiple windows land with M11.5	多窗口将在 M11.5 中提供
+@msg	New Window isn't available yet: a document opens in one window	新建窗口尚不可用：文档在一个窗口中打开
 @msg	no PNG encoder	没有 PNG 编码器
 @msg	no document open	没有打开的文档
 @msg	no effect applied yet	尚未应用任何效果

crates/ui-egui/src/i18n/zh-hant.tsv

@@ -2150,7 +2150,7 @@ file-filter	Templates	範本
 @msg	missing `name`	未提供 `name`
 @msg	missing `tool`	未提供 `tool`
 @msg	missing index	未提供 index
-@msg	multiple windows land with M11.5	多個視窗將於 M11.5 推出
+@msg	New Window isn't available yet: a document opens in one window	新增視窗尚無法使用：文件會在一個視窗中開啟
 @msg	no PNG encoder	沒有 PNG 編碼器
 @msg	no document open	沒有開啟的文件
 @msg	no effect applied yet	尚未套用任何效果

crates/ui-egui/src/menus.rs

@@ -1681,7 +1681,7 @@ pub fn run_ui_command(app: &mut VectorcraftApp, id: &str, p: &Value) -> Option<R
             }
             None => Err("brightness must be dark|mediumDark|mediumLight|light".into()),
         },
-        "window.newWindow" => Err("multiple windows land with M11.5".into()),
+        "window.newWindow" => Err("New Window isn't available yet: a document opens in one window".into()),
         "tool.select" => match s("tool") {
             Some(t) if vectorcraft_tools::tool_info(&t).is_some() => {
                 app.select_tool(&t);
@@ -2574,6 +2574,8 @@ pub fn enabled(app: &VectorcraftApp, id: &str) -> bool {
             app.session.active().is_some() && crate::dialogs::perspective_presets::slot_preset(app, id).is_some()
         }
         "ui.perspectivePlane" => app.session.active().is_some(),
+        // Only one window per document so far: greyed out, as Window › Arrange's items are (#3724).
+        "window.newWindow" => false,
         _ => true,
     }
 }
@@ -4966,4 +4968,15 @@ mod tests {
         assert!(tall.height() > short.height() + 100.0, "{} vs {}", tall.height(), short.height());
         assert!(tall.bottom() < 3000.0);
     }
+
+    /// #3724: Window › New Window is greyed out until VectorCraft can open a second window on a
+    /// document, instead of being enabled and answering with an internal milestone note.
+    #[test]
+    fn new_window_is_disabled_until_it_opens_a_window() {
+        let mut app = VectorcraftApp::new(vectorcraft_engine::Session::new(), crate::Services::default());
+        app.run("file.new", json!({"width": 200, "height": 200})).unwrap();
+        assert!(!enabled(&app, "window.newWindow"), "New Window is enabled but opens no window");
+        let e = app.run("window.newWindow", json!({})).unwrap_err();
+        assert!(!e.contains("M11.5"), "a user-facing message, not a milestone: {e}");
+    }
 }