org.el (org-refresh-properties): Bugfix
* org.el (org-refresh-properties): Don't add the property to
the whole subtree, only to the part between the beginning of
the headline and the end of the "content", before any other
headline. This fix a bug about properties displayed as
inherited in the agenda, where Org properties are checked
against text properties.
Thanks to Sébastien Vauban for reporting this.