Make `root='/'` work cross-platform

If `root` already ends in `os.sep`, don't add another one.
`abspath` strips trailing slashes from all paths _except_ root (C:\, /)

1 files changed, 1 insertions, 1 deletions

diff --git a/bottle.py b/bottle.py
index f6add8a..4787e08 100644
--- a/bottle.py
+++ b/bottle.py
@@ -2352,7 +2352,7 @@ def static_file(filename, root, mimetype='auto', download=False, charset='UTF-8'
             mime-type. (default: UTF-8)
     """
 
-    root = os.path.abspath(root) + os.sep
+    root = os.path.join(os.path.abspath(root), '')
     filename = os.path.abspath(os.path.join(root, filename.strip('/\\')))
     headers = dict()