[fix] problem with gantt view, can not slide a task
[fix] problem with gantt view, can not slide a task

MarkusTeufelberger/openerp-web,gisce/openerp-web,splbio/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,MarkusTeufelberger/openerp-web