#2495: cancel the browser default for Ctrl+D on layouts where D types no ASCII letter

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RDvxCS8xcR28VArjzn1x7U

apps/effectcraft-web/js/host.js

@@ -10,12 +10,15 @@
 // ------------------------------------------------------------------ shortcuts
 
 /// Keep Duplicate on the app canvas instead of also opening the browser's bookmarks.
+/// The physical D key counts on layouts where it types no ASCII letter (e.g. Cyrillic), because
+/// eframe falls back to the key code there; it does not on Dvorak, where it types E.
 /// eframe still receives the key; other chords and HTML inputs keep their browser behavior.
 export function installCanvasShortcuts(canvas) {
   canvas.addEventListener("keydown", (event) => {
     if (event.target === canvas && (event.ctrlKey || event.metaKey)
       && !event.shiftKey && !event.altKey && !event.isComposing
-      && event.key.toLowerCase() === "d") {
+      && (event.key.toLowerCase() === "d"
+        || (event.code === "KeyD" && !/^[a-z]$/i.test(event.key)))) {
       event.preventDefault();
     }
   }, { capture: true });

apps/effectcraft-web/tests/page.mjs

@@ -77,7 +77,11 @@ assert.equal(key(canvas, { metaKey: true, key: "D" }), true);
 for (const properties of [{}, { ctrlKey: true, shiftKey: true }, { ctrlKey: true, altKey: true }, { ctrlKey: true, isComposing: true }, { ctrlKey: true, key: "r" }]) {
   assert.equal(key(canvas, properties), false);
 }
-assert.equal(delivered, 7, "all keys still reach the app");
+// Non-Latin layouts: the physical D key types "в", and eframe still reads it as D.
+assert.equal(key(canvas, { ctrlKey: true, key: "в", code: "KeyD" }), true);
+// Dvorak: the physical D key types "e", which is not Duplicate.
+assert.equal(key(canvas, { ctrlKey: true, key: "e", code: "KeyD" }), false);
+assert.equal(delivered, 9, "all keys still reach the app");
 assert.equal(key(input, { ctrlKey: true }), false, "an external HTML input keeps its shortcut");
 
 // #226: one readable and one unreadable file.