[FIX] ir_qweb: don't use a stylesheet cached by another bundle.

An issue could arise if a preprocessed stylesheet asset is present
in multiple bundles: the first bundle will cache a version of this
file (identified by its url) and the second one will cache another
one. The next time the first bundle is rendered in debug mode, it
will use the last created record of the asset.

This could lead to design issues as, for instance, a less asset
could change according to another less asset included in the bundle.

We fix this issue by adding the xmlid of the bundle in the url's
asset. This fix another inconsistency as the compiled version of
an asset is reachable with an url that is not dependent of its
bundle, so if the asset is present in multiple bundle it could
return different values.

Note: this only concern the debug mode

openerp/addons/base/ir/ir_qweb.py

@@ -1340,7 +1340,7 @@ class AssetsBundle(object):
         preprocessed = True
         for atype in (SassStylesheetAsset, LessStylesheetAsset):
             outdated = False
-            assets = dict((asset.html_url % asset.url, asset) for asset in self.stylesheets if isinstance(asset, atype))
+            assets = dict((asset.html_url, asset) for asset in self.stylesheets if isinstance(asset, atype))
             if assets:
                 assets_domain = [('url', 'in', assets.keys())]
                 ira_ids = self.registry['ir.attachment'].search(self.cr, uid, assets_domain)
@@ -1391,7 +1391,7 @@ class AssetsBundle(object):
                         try:
                             ira = self.registry['ir.attachment']
                             fname = os.path.basename(asset.url)
-                            url = asset.html_url % asset.url
+                            url = asset.html_url
                             with self.cr.savepoint():
                                 ira.create(self.cr, openerp.SUPERUSER_ID, dict(
                                     datas=asset.content.encode('utf8').encode('base64'),
@@ -1455,13 +1455,14 @@ class AssetsBundle(object):
         return error
 
 class WebAsset(object):
-    html_url = '%s'
+    html_url_format = '%s'
 
     def __init__(self, bundle, inline=None, url=None):
         self.id = str(uuid.uuid4())
         self.bundle = bundle
         self.inline = inline
         self.url = url
+        self.html_url_args = url
         self.cr = bundle.cr
         self.uid = bundle.uid
         self.registry = bundle.registry
@@ -1474,6 +1475,10 @@ class WebAsset(object):
         if not inline and not url:
             raise Exception("An asset should either be inlined or url linked")
 
+    @property
+    def html_url(self):
+        return self.html_url_format % self.html_url_args
+
     def stat(self):
         if not (self.inline or self._filename or self._ir_attach):
             path = filter(None, self.url.split('/'))
@@ -1552,7 +1557,7 @@ class JavascriptAsset(WebAsset):
 
     def to_html(self):
         if self.url:
-            return '<script type="text/javascript" src="%s"></script>' % (self.html_url % self.url)
+            return '<script type="text/javascript" src="%s"></script>' % (self.html_url)
         else:
             return '<script type="text/javascript" charset="utf-8">%s</script>' % self.with_header()
 
@@ -1612,15 +1617,19 @@ class StylesheetAsset(WebAsset):
     def to_html(self):
         media = (' media="%s"' % werkzeug.utils.escape(self.media)) if self.media else ''
         if self.url:
-            href = self.html_url % self.url
+            href = self.html_url
             return '<link rel="stylesheet" href="%s" type="text/css"%s/>' % (href, media)
         else:
             return '<style type="text/css"%s>%s</style>' % (media, self.with_header())
 
 class PreprocessedCSS(StylesheetAsset):
-    html_url = '%s.css'
     rx_import = None
 
+    def __init__(self, *args, **kw):
+        super(PreprocessedCSS, self).__init__(*args, **kw)
+        self.html_url_format = '%%s/%s/%%s.css' % self.bundle.xmlid
+        self.html_url_args = tuple(self.url.rsplit('/', 1))
+
     def minify(self):
         return self.with_header()