[FIX] web_editor: remove breaking cache of transcoder

The web_editor transcoder, who is in charge to change mail css style
into inline style and vice versa, has a cache to improve its
efficiency. The problem is that it was designed to work only if a
particular "<tag>.className" has always the same css style no matter
what its parent or neighbors are. This is obviously not compatible
with theme switching. Indeed, only by switching from one theme to
another, the parent of every snippet have a different className which
is used in css to design differently every snippet. Also inside a same
theme, we obviously want to be able to style a particuler .myClass
element differently from one snippet to another without having to
multiple css classes.

This commit removes the cache system to allow theme switching and
liberty in theme designing. This however make the edition start and
the saving really slower...

1 files changed, 1 insertions, 5 deletions

diff --git a/addons/web_editor/static/src/js/transcoder.js b/addons/web_editor/static/src/js/transcoder.js
index fbdc4b34b87..ddd8ce73533 100644
--- a/addons/web_editor/static/src/js/transcoder.js
+++ b/addons/web_editor/static/src/js/transcoder.js
@@ -3,12 +3,8 @@ odoo.define('web_editor.transcoder', function (require) {
 
 var widget = require('web_editor.widget');
 
-var cache = {};
 var rulesCache = [];
 var getMatchedCSSRules = function (a) {
-    if(cache[a.tagName + "." +a.className]) {
-        return cache[a.tagName + "." +a.className];
-    }
     if (!rulesCache.length) {
         var sheets = document.styleSheets;
         for(var i = sheets.length-1; i >= 0 ; i--) {
@@ -117,7 +113,7 @@ var getMatchedCSSRules = function (a) {
         delete style['padding-left'];
     }
 
-    return a.className ? cache[a.tagName + "." +a.className] = style : style;
+    return style;
 };
 
 // convert font awsome into image