Don't allow an event drag behond the rightmost limit.
Don't allow an event drag behond the rightmost limit.

svn path=/branches/KDE/4.2/kdepim/; revision=920773

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi