Popover keys now use virtual codes.

src/PopoverPanel.swift

@@ -43,24 +43,20 @@ class PopoverPanel: NSPanel {
         Self.logger.debug("performKeyEquivalent keyCode=\(event.keyCode)")
         let commandKey = NSEvent.ModifierFlags.command.rawValue
 
-        // TODO: Make these depend on virtual keycodes, instead of
-        //       characters.
         if event.type == NSEvent.EventType.keyDown {
             if (event.modifierFlags.rawValue &
                 NSEvent.ModifierFlags.deviceIndependentFlagsMask.rawValue)
-                == commandKey,
+                == commandKey, event.keyCode == 13 // W
-                event.charactersIgnoringModifiers! == "w"
             {
                 resignKey()
                 return true
             } else if (event.modifierFlags.rawValue &
                 NSEvent.ModifierFlags.deviceIndependentFlagsMask.rawValue)
-                == commandKey,
+                == commandKey, event.keyCode == 12 // Q
-                event.charactersIgnoringModifiers! == "q"
             {
                 NSApplication.shared.terminate(self)
                 return true
-            } else if event.keyCode == 53 {
+            } else if event.keyCode == 53 { // ESC
                 resignKey()
                 return true
             }