Dashboard editor live validation (#540)

* Dashboard editor validation

* Improve range detection

* Lint

esphome/config_helpers.py

@@ -2,6 +2,7 @@ from __future__ import print_function
 
 import codecs
 import json
+import os
 
 from esphome.core import CORE, EsphomeError
 from esphome.py_compat import safe_input
@@ -9,7 +10,8 @@ from esphome.py_compat import safe_input
 
 def read_config_file(path):
     # type: (basestring) -> unicode
-    if CORE.vscode:
+    if CORE.vscode and (not CORE.ace or
+                        os.path.abspath(path) == os.path.abspath(CORE.config_path)):
         print(json.dumps({
             'type': 'read_file',
             'path': path,