[FIX] Wall: fixed post button exceeding its parent container due to unknown oe_clear class in trunk. Added :after to clear the view.

bzr revid: tde@openerp.com-20120413120010-3s6mvkql0wy8kn9n

addons/mail/static/src/css/mail.css

@@ -8,6 +8,12 @@
     background: white;
 }
 
+.openerp div.oe_mail_wall_act:after {
+    content: "";
+    display: block;
+    clear: both; 
+}
+
 /* 2 columns view */
 .openerp div.oe_mail_wall_left {
     float: left;