fix: final pre-PR review sweep

The final holistic + quality audit (three reviewers) returned GO with four majors; all fixed. - Start-page recents were the last unguarded writer of the open slot on web: clicking one under the open overlay clobbered the in-flight open and silently lost its bytes. Refused with the same in-progress notice the picker uses. - The web quit-after-save continuation stalled: a Quit pending now survives the tab-save AND continues — offering to save the next dirty tab or finishing the quit, mirroring native. - Data-extraction's multi-file pick is capped (16): every picked file becomes a full parsed document held for the session, and one giant pick could exhaust the wasm heap. - The xref registry tests raced each other on the process-global registry (reproduced 3/10 at high thread counts — CI roulette); they now hold a module-level guard. Minors: the collision warning is cataloged in all 21 locales; the docs' parallelism detail header no longer contradicts its own table; the drop-filter and name-hash helpers gained inline tests (their only prior coverage was a verbatim copy in the red-team suites). (cherry picked from commit f70d3fda) Ported onto main (#1717 review): the collision message is filed under the file group it is looked up in (it sat under view), the data-link warning reuses that cataloged text, and the command-reference string that rode along in the locale hunks stays out.
2026-10-12 12:02:05 +03:00
1 parent 108ef045b8
commit 8a5d343927
@@ -76,7 +76,7 @@ shared: native renders the same modals too, so the desktop is effectively
 single-window now. A modal's backdrop dims and blocks clicks but does not
 dismiss; the ✕ button closes it.

-### Parallelism — web: single-threaded
+### Parallelism — web: main thread plus one parse/serialize worker
 `wasm32` has no threads without SharedArrayBuffer (which needs COOP/COEP
 headers GitHub Pages can't set). `crate::par::prelude` re-exports `rayon` on
 native and sequential `std` iterators on wasm, so the same call sites run in
@@ -2407,6 +2407,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  الموضع [استبدال/بادئة/لاحقة] <استبدال>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" محمّل بالفعل بمحتوى مختلف؛ تم الاحتفاظ بالملف الموجود.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   التحليل __ocs_fmt_0__ ملث · التنظيف __ocs_fmt_1__ ملث · الذاكرة المؤقتة __ocs_fmt_2__ ملث · المرجع الخارجي __ocs_fmt_3__ ملث · الإجمالي __ocs_fmt_4__ ملث
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: احفظ الرسم أولًا (ليس له مسار ملف بعد).
    .autosaved-1-drawing = حُفظ رسم واحد تلقائيًا
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  поставяне [Замяна/Префикс/Суфикс] <Замяна>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" вече е зареден с различно съдържание; съществуващият файл е запазен.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   анализ __ocs_fmt_0__ms · изчистване __ocs_fmt_1__ms · кешове __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · общо __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: първо запази чертежа (все още няма път до файл).
    .autosaved-1-drawing = Автоматично запазен 1 чертеж
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = Umístění TCOUNT [přepsat/předpona/přípona] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" je již načten s jiným obsahem; existující soubor byl zachován.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   analyzovat __ocs_fmt_0__ms · vyčistit __ocs_fmt_1__ms · mezipaměti __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · celkem __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: nejprve uložte výkres (ještě nemá žádnou cestu k souboru).
    .autosaved-1-drawing = Automaticky uložen 1 výkres
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  Platzierung [Überschreiben/Präfix/Suffix] <Überschreiben>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" ist bereits mit anderem Inhalt geladen; die vorhandene Datei wurde behalten.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = analysiere __ocs_fmt_0__ms · Säubere __ocs_fmt_1__ms · Puffer __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · gesamt __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: Speichern Sie die Zeichnung zuerst (sie hat noch keinen Dateipfad).
    .autosaved-1-drawing = 1 Zeichnung automatisch gespeichert
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  τοποθέτηση [Αντικατάσταση/Πρόθεμα/Κατάληξη] <Αντικατάσταση>:

 file =
+    .already-loaded-different-contents-kept = Το "__ocs_fmt_0__" είναι ήδη φορτωμένο με διαφορετικό περιεχόμενο· διατηρήθηκε το υπάρχον αρχείο.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = ανάλυση __ocs_fmt_0__ms · εκκαθάριση __ocs_fmt_1__ms · κρυφές μνήμες __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · σύνολο __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: αποθηκεύστε πρώτα το σχέδιο (δεν έχει ακόμη διαδρομή αρχείου).
    .autosaved-1-drawing = Αυτόματη αποθήκευση 1 σχεδίου
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  placement [Overwrite/Prefix/Suffix] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" is already loaded with different contents; the existing file was kept.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   parse __ocs_fmt_0__ms · purge __ocs_fmt_1__ms · caches __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · total __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: save the drawing first (it has no file path yet).
    .autosaved-1-drawing = Autosaved 1 drawing
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  colocación [Sobrescribir/Prefijo/Sufijo] <Sobrescribir>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" ya está cargado con contenido diferente; se conservó el archivo existente.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   análisis __ocs_fmt_0__ ms · limpieza __ocs_fmt_1__ ms · cachés __ocs_fmt_2__ ms · ref. ext. __ocs_fmt_3__ ms · total __ocs_fmt_4__ ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: guarde primero el dibujo (todavía no tiene una ruta de archivo).
    .autosaved-1-drawing = Se guardó automáticamente 1 dibujo
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT-sijoittelu [Korvaa/etuliite/liite] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" on jo ladattu eri sisällöllä; olemassa oleva tiedosto säilytettiin.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   jäsentää __ocs_fmt_0__ms · tyhjentää __ocs_fmt_1__ms · välimuistit __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · yhteensä __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: tallenna piirustus ensin (sillä ei ole vielä tiedostopolkua).
    .autosaved-1-drawing = Automaattisesti tallennettu 1 piirros
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  Position [Remplacer/Préfixe/Suffixe] <Remplacer> :

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" est déjà chargé avec un contenu différent ; le fichier existant a été conservé.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = Analyse : __ocs_fmt_0__ ms, purge : __ocs_fmt_1__ ms, caches : __ocs_fmt_2__ ms, références externes : __ocs_fmt_3__ ms, total : __ocs_fmt_4__ ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE : enregistrer le dessin en premier (il n'a pas encore de chemin de fichier).
    .autosaved-1-drawing = 1 dessin enregistré automatiquement
@@ -2383,6 +2383,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  स्थान [अधिलेखित/उपसर्ग/प्रत्यय] <अधिलेखित>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" अलग सामग्री के साथ पहले से लोड है; मौजूदा फ़ाइल रखी गई।
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   पार्स __ocs_fmt_0__ms · purge __ocs_fmt_1__Ms · कैश __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · कुल __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: पहले ड्रॉइंग सहेजें (अभी फ़ाइल पथ निर्धारित नहीं है)।
    .autosaved-1-drawing = 1 ड्रॉइंग स्वतः सहेजी गई
@@ -2407,6 +2407,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT elhelyezés [Overwrite (Felülírás) / Prefix (Előtag) / Suffix (Utótag)] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = A(z) "__ocs_fmt_0__" már betöltve eltérő tartalommal; a meglévő fájl megőrizve.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = elemzése __ocs_fmt_0__ms · __ocs_fmt_1__ms törlése · gyorsítótárak __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · összesen __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: először mentse a rajzot (még nincs fájl elérési útja).
    .autosaved-1-drawing = Automatikusan mentett 1 rajzot
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = Posizionamento TCOUNT [Sovrascrivi/Prefisso/Suffisso] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" è già caricato con contenuti diversi; il file esistente è stato mantenuto.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   analizza __ocs_fmt_0__ms · elimina __ocs_fmt_1__ms · memorizza nella cache __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · totale __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: salva prima il disegno (non ha ancora il percorso del file).
    .autosaved-1-drawing = 1 disegno salvato automaticamente
@@ -2385,6 +2385,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  配置 [Overwrite/Prefix/Suffix] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" は既に別の内容で読み込まれています。既存のファイルを保持しました。
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   解析 __ocs_fmt_0__ms · パージ __ocs_fmt_1__ms · キャッシュ __ocs_fmt_2__ms · 外部参照 __ocs_fmt_3__ms · 合計 __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: 先に図面を保存してください（まだファイルパスがありません）。
    .autosaved-1-drawing = 1 件の図面を自動保存しました
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT 배치 [덮어쓰기/접두사/접미사] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__"이(가) 이미 다른 내용으로 로드되었습니다. 기존 파일을 유지했습니다.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   __ocs_fmt_0__ms 구문 분석 · __ocs_fmt_1__ms 제거 · 캐시 __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · 총 __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: 먼저 도면을 저장합니다(아직 파일 경로가 없음).
    .autosaved-1-drawing = 그림 1개 자동 저장됨
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  Plaatsing [Overschrijven/Voorvoegsel/Achtervoegsel] <Overschrijven>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" is al geladen met andere inhoud; het bestaande bestand is bewaard.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = ontleed __ocs_fmt_0__ms · zuivering __ocs_fmt_1__ms · caches __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · totaal __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: sla de tekening eerst op (er is nog geen bestandspad).
    .autosaved-1-drawing = Automatisch opslaan van 1 tekening
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = Umieszczenie TCOUNT [Nadpisanie/Przedrostek/Sufiks] <Overwrite>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" jest już wczytany z inną zawartością; zachowano istniejący plik.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   analizuj __ocs_fmt_0__ms · usuwaj __ocs_fmt_1__ms · pamięci podręczne __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · łącznie __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: najpierw zapisz rysunek (nie ma on jeszcze ścieżki do pliku).
    .autosaved-1-drawing = Automatycznie zapisano 1 rysunek
@@ -2395,6 +2395,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  posicionamento [Sobrescrever/Prefixo/Sufixo] <Sobrescrever>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" já está carregado com conteúdo diferente; o ficheiro existente foi mantido.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms =   análise __ocs_fmt_0__ms · limpeza __ocs_fmt_1__ms · caches __ocs_fmt_2__ms · ref. externa __ocs_fmt_3__ms · total __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: salve o desenho primeiro (ele ainda não tem um caminho de arquivo).
    .autosaved-1-drawing = 1 desenho salvo automaticamente
@@ -2398,6 +2398,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  Размещение [Заменить/Префикс/Суффикс] <Заменить>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" уже загружен с другим содержимым; существующий файл сохранён.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = parse __ocs_fmt_0__ms · чистка __ocs_fmt_1__ms · кэши __ocs_fmt_2__ms · xref __ocs_fmt_3__ms · общая __ocs_fmt_4__ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: сначала сохраните чертёж (путь к файлу ещё не задан).
    .autosaved-1-drawing = Автоматически сохранён 1 чертёж
@@ -2379,6 +2379,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  Yerleştirme [Üzerine yaz/Önek/Sonek] <Üzerine yaz>:

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__" zaten farklı içerikle yüklü; mevcut dosya tutuldu.
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = ayrıştırma __ocs_fmt_0__ ms · temizleme __ocs_fmt_1__ ms · önbellekler __ocs_fmt_2__ ms · xref __ocs_fmt_3__ ms · toplam __ocs_fmt_4__ ms
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE: önce çizimi kaydedin; çizimin henüz bir dosya yolu yok.
    .autosaved-1-drawing = 1 çizim otomatik kaydedildi
@@ -2382,6 +2382,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  放置方式 [覆盖/前缀/后缀] <覆盖>：

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__"已以不同内容加载；保留了现有文件。
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = 解析 __ocs_fmt_0__ 毫秒 · 清除 __ocs_fmt_1__ 毫秒 · 缓存 __ocs_fmt_2__ 毫秒 · xref __ocs_fmt_3__ 毫秒 · 总计 __ocs_fmt_4__ 毫秒
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE：请先保存图形（尚未设置文件路径）。
    .autosaved-1-drawing = 自动保存了 1 个绘图
@@ -2394,6 +2394,7 @@ command =
    .tcount-placement-overwrite-prefix-suffix-overw = TCOUNT  放置方式 [覆蓋/前綴/後綴] <覆蓋>：

 file =
+    .already-loaded-different-contents-kept = "__ocs_fmt_0__"已以不同內容載入；保留了現有檔案。
    .parse-ms-purge-ms-caches-ms-xref-ms-total-ms = 解析 __ocs_fmt_0__ 毫秒 · 清除 __ocs_fmt_1__ 毫秒 · 快取 __ocs_fmt_2__ 毫秒 · xref __ocs_fmt_3__ 毫秒 · 總計 __ocs_fmt_4__ 毫秒
    .archive-save-the-drawing-first-it-has-no-file = ARCHIVE：請先儲存圖形（尚未設定檔案路徑）。
    .autosaved-1-drawing = 自動儲存了 1 個繪圖
@@ -1338,7 +1338,7 @@ impl OpenCADStudio {
        if let Some(name) = take_last_collision().take() {
            self.command_line.push_warning(
                crate::tf!(
-                    "\"{name}\" is already loaded from another folder with different contents; re-picking it was ignored to keep the existing link."
+                    "\"{name}\" is already loaded with different contents; the existing file was kept."
                )
                .as_ref(),
            );
@@ -1911,6 +1911,16 @@ impl OpenCADStudio {
                    .pick_files()
                    .await
                    .unwrap_or_default();
+                // Each picked file becomes a full parsed document held in
+                // the registry for the session; a bound keeps a giant
+                // multi-pick from exhausting the wasm heap (tab death).
+                const MAX_EXTRACTION_SOURCES: usize = 16;
+                if handles.len() > MAX_EXTRACTION_SOURCES {
+                    return Err(crate::tf!(
+                        "At most {MAX_EXTRACTION_SOURCES} drawings can be added in the browser."
+                    )
+                    .into_owned());
+                }
                let mut paths = Vec::new();
                for handle in handles {
                    let name = handle.file_name();
@@ -2850,6 +2850,13 @@ impl OpenCADStudio {
                    let rest = self.continue_tab_close_queue();
                    return Task::batch([continuation, rest]);
                }
+            } else if matches!(self.pending_close, Some(crate::app::PendingClose::Quit)) {
+                // Mirror the native Quit continuation: offer to save the
+                // next dirty tab, or finish the quit.
+                if self.tabs.iter().any(|tab| tab.dirty) {
+                    return self.open_unsaved_dialog_window();
+                }
+                return Task::batch([self.close_unsaved_dialog_window(), self.exit_app()]);
            } else if self.pending_close.is_some() {
                return self.open_unsaved_dialog_window();
            }
@@ -861,6 +861,16 @@ impl OpenCADStudio {
                        .file_name()
                        .map(|name| name.to_string_lossy().into_owned())
                        .unwrap_or_else(|| path.to_string_lossy().into_owned());
+                    // The start page stays clickable under the open overlay,
+                    // so a recent can race an in-flight open and clobber it
+                    // (its WebFileOpened then fails the id check and the
+                    // bytes are lost) — refuse like on_open_file does.
+                    if self.opening.is_some() {
+                        self.command_line.push_info(
+                            crate::t!("An open is already in progress.").as_ref(),
+                        );
+                        return Task::none();
+                    }
                    let state = std::sync::Arc::new(crate::io::OpenProgressState::new(
                        crate::app::OPEN_PHASE_READING,
                    ));
@@ -290,3 +290,20 @@ fn is_image_name(name: &str) -> bool {
        "png" | "jpg" | "jpeg" | "bmp" | "tiff" | "tif"
    )
 }
+
+#[cfg(test)]
+mod tests {
+    use super::is_drawing_name;
+
+    #[test]
+    fn drawing_names_use_the_worker_convention() {
+        assert!(is_drawing_name("plan.dwg"));
+        assert!(is_drawing_name("PLAN.DXF"));
+        assert!(is_drawing_name("DWG"));
+        assert!(is_drawing_name("dxf"));
+        assert!(!is_drawing_name("plan.png"));
+        assert!(!is_drawing_name("dwgx"));
+        assert!(!is_drawing_name("plan.dwg.txt"));
+        assert!(!is_drawing_name(""));
+    }
+}
@@ -312,3 +312,23 @@ pub(crate) async fn modified_ms(name: &str) -> Option<f64> {
        .ok()?;
    Some(file.last_modified())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::name_hash;
+
+    /// Canonical FNV-1a 64 over the raw name bytes — the reference vector
+    /// from the spec's test suite.
+    #[test]
+    fn name_hash_is_fnv1a64() {
+        assert_eq!(name_hash(""), "cbf29ce484222325");
+        assert_eq!(name_hash("a"), "af63dc4c8601ec8c");
+        assert_eq!(name_hash("foobar"), "85944171f73967e8");
+    }
+
+    #[test]
+    fn name_hash_distinguishes_case_and_extension() {
+        assert_ne!(name_hash("a.dwg"), name_hash("A.dwg"));
+        assert_ne!(name_hash("a.dwg"), name_hash("a.dxf"));
+    }
+}
@@ -3529,6 +3529,16 @@ fn relative_point_cloud_path(doc: &mut CadDocument, handle: Handle, host: &Path)
 mod web_registry_tests {
    use super::*;

+    /// The registries are process-global and the default harness runs tests
+    /// in parallel; the eviction test's inserts can evict a sibling test's
+    /// entry mid-assert. Registry tests hold this lock for their duration.
+    fn registry_guard() -> std::sync::MutexGuard<'static, ()> {
+        static LOCK: OnceLock<Mutex<()>> = OnceLock::new();
+        LOCK.get_or_init(|| Mutex::new(()))
+            .lock()
+            .unwrap_or_else(|poisoned| poisoned.into_inner())
+    }
+
    fn outcome() -> codec::ReadOutcome {
        codec::ReadOutcome::new(CadDocument::new(), codec::ReadStats::default())
    }
@@ -3560,6 +3570,7 @@ mod web_registry_tests {

    #[test]
    fn registry_finds_a_registered_source_by_trailing_name() {
+        let _registry = registry_guard();
        let registered = "Registry-Find-Site.dwg";
        register_source(registered, Arc::new(vec![1, 2, 3]));
        // The drawing's stored path is the author's absolute foreign path;
@@ -3579,6 +3590,7 @@ mod web_registry_tests {
    /// re-registration of a live name neither evicts nor duplicates it.
    #[test]
    fn source_registry_evicts_oldest_beyond_the_cap() {
+        let _registry = registry_guard();
        for i in 0..(SOURCE_CAP + 2) {
            register_source(&format!("f{i}.dwg"), Arc::new(vec![i as u8]));
        }
@@ -3618,6 +3630,7 @@ mod web_registry_tests {

    #[test]
    fn register_source_supersedes_a_cached_parse_of_the_same_file() {
+        let _registry = registry_guard();
        let name = "Registry-Supersede-Plan.dwg";
        register_parsed(name, outcome());
        // Re-registering the same file under a differently-cased path name
@@ -2278,6 +2278,7 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
        "Opening \"{name}\" ({size_label})…" => Some(("common", "opening-name-size-label")),
        "Opening OCS Discussions for help and questions..." => Some(("view", "opening-ocs-discussions-for-help-and-questions")),
        "Opening OCS Web..." => Some(("view", "opening-ocs-web")),
+        "\"{name}\" is already loaded with different contents; the existing file was kept." => Some(("file", "already-loaded-different-contents-kept")),
        "Opening Patreon page..." => Some(("view", "opening-patreon-page")),
        "Opening feedback page..." => Some(("view", "opening-feedback-page")),
        "Opening file" => Some(("ui", "opening-file")),