Fix inspector toggle on US international keyboards

On US international keyboards Ctrl + Alt are combined into AltGraph.
When this happens Ctrl and Alt are registered as unpressed,
breaking the toggle expression

Author: svenkonings

src/index.js

@@ -172,7 +172,9 @@ Inspector.prototype = {
   initEvents: function () {
     window.addEventListener('keydown', (evt) => {
       // Alt + Ctrl + i: Shorcut to toggle the inspector
-      var shortcutPressed = evt.keyCode === 73 && evt.ctrlKey && evt.altKey;
+      var shortcutPressed =
+        evt.keyCode === 73 &&
+        ((evt.ctrlKey && evt.altKey) || evt.getModifierState('AltGraph'));
       if (shortcutPressed) {
         this.toggle();
       }