Merge pull request #587 from pathmapper/matchingbrackets_addon

Add matchbrackets addon to JSON editor

src/components/layers/JSONEditor.jsx

@@ -7,6 +7,7 @@ import CodeMirror from 'codemirror';
 
 import 'codemirror/mode/javascript/javascript'
 import 'codemirror/addon/lint/lint'
+import 'codemirror/addon/edit/matchbrackets'
 import 'codemirror/lib/codemirror.css'
 import 'codemirror/addon/lint/lint.css'
 import '../../codemirror-maputnik.css'
@@ -47,6 +48,7 @@ class JSONEditor extends React.Component {
       viewportMargin: Infinity,
       lineNumbers: true,
       lint: true,
+      matchBrackets: true,
       gutters: ["CodeMirror-lint-markers"],
       scrollbarStyle: "null",
     });