Merge pull request #1185 from winnerNick/dev

Sort also the directory name for proper ordering between css and js plugin folders

Author: alexcjohnson

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 - [#1249](https://github.com/plotly/dash/pull/1249) Fixes [#919](https://github.com/plotly/dash/issues/919) so `dash.testing` is compatible with more `pytest` plugins, particularly `pytest-flake8` and `pytest-black`.
 - [#1248](https://github.com/plotly/dash/pull/1248) Fixes [#1245](https://github.com/plotly/dash/issues/1245), so you can use prop persistence with components that have dict IDs, ie for pattern-matching callbacks.
+- [#1185](https://github.com/plotly/dash/pull/1185) Sort asset directories, same as we sort files inside those directories. This way if you need your assets loaded in a certain order, you can add prefixes to subdirectory names and enforce that order.
 
 ## [1.12.0] - 2020-05-05
 ### Added

dash/dash.py

@@ -1066,7 +1066,7 @@ def _walk_assets_directory(self):
         ignore_str = self.config.assets_ignore
         ignore_filter = re.compile(ignore_str) if ignore_str else None
 
-        for current, _, files in os.walk(walk_dir):
+        for current, _, files in sorted(os.walk(walk_dir)):
             if current == walk_dir:
                 base = ""
             else: