if focusTo provided, ensure webview is focused

fixes https://anki.tenderapp.com/discussions/beta-testing/661-anki-210-beta-7#comment_43155562

aqt/editor.py

@@ -266,6 +266,9 @@ class Editor:
             self.checkValid()
             runHook("loadNote", self)
 
+        if focusTo is not None:
+            self.web.setFocus()
+
         self.web.evalWithCallback("setFields(%s, %s); setFonts(%s); focusField(%s)" % (
             json.dumps(data), json.dumps(self.prewrapMode()),
             json.dumps(self.fonts()), json.dumps(focusTo)),