Perform callback detection before toLowerCase()

Author: Joachim Seminck

lib/rules/jsx-sort-props.js

@@ -150,6 +150,8 @@ module.exports = {
           var currentPropName = propName(decl);
           var previousValue = memo.value;
           var currentValue = decl.value;
+          var previousIsCallback = isCallbackPropName(previousPropName);
+          var currentIsCallback = isCallbackPropName(currentPropName);
 
           if (ignoreCase) {
             previousPropName = previousPropName.toLowerCase();
@@ -186,9 +188,6 @@ module.exports = {
           }
 
           if (callbacksLast) {
-            var previousIsCallback = isCallbackPropName(previousPropName);
-            var currentIsCallback = isCallbackPropName(currentPropName);
-
             if (!previousIsCallback && currentIsCallback) {
               // Entering the callback prop section
               return decl;