Index: trunk/src/org/openstreetmap/josm/tools/KeyboardUtils.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/KeyboardUtils.java	(revision 14277)
+++ trunk/src/org/openstreetmap/josm/tools/KeyboardUtils.java	(revision 14279)
@@ -183,4 +183,8 @@
                 // BÉPO, https://en.wikipedia.org/wiki/Keyboard_layout#B%C3%89PO
                 result.add('$');
+                if (PlatformManager.isPlatformUnixoid()) {
+                    // X11 fr-latin9
+                    result.add('œ');
+                }
                 break;
             case "sq": // Albanian
@@ -297,6 +301,6 @@
             // Add default US QWERTY keys, https://en.wikipedia.org/wiki/QWERTY
             // Works also for Dvorak, https://en.wikipedia.org/wiki/Dvorak_Simplified_Keyboard
-            result.add('`'); // On US QWERTY, this is not a dead key
-            result.add((char) KeyEvent.VK_DEAD_GRAVE); // On International QWERTY, this is a dead key
+            result.add('`'); // U+0060: On US QWERTY, this is not a dead key
+            result.add('ˋ'); // U+02CB: On International QWERTY, this is a dead key
             return result;
         }