Fix pmc path ordering update.

Author: T4rk1n

dash/dash-renderer/src/actions/paths.js

@@ -3,9 +3,11 @@ import {
  filter,
  find,
  forEachObjIndexed,
+ insert,
  path,
  propEq,
- props
+ props,
+ indexOf
 } from 'ramda';
 
 import {crawlLayout} from './utils';
@@ -46,7 +48,14 @@ export function computePaths(subTree, startingPath, oldPaths, events) {
  const values = props(keys, id);
  const keyStr = keys.join(',');
  const paths = (objs[keyStr] = objs[keyStr] || []);
- paths.push({values, path: concat(startingPath, itempath)});
+ const oldie = oldObjs[keyStr] || [];
+ const item = {values, path: concat(startingPath, itempath)};
+ const index = indexOf(item, oldie);
+ if (index === -1) {
+ paths.push(item);
+ } else {
+ objs[keyStr] = insert(index, item, paths);
+ }
  } else {
  strs[id] = concat(startingPath, itempath);
  }