Only start left mouse button timer when the left mouse button popup is enabled.
Only start left mouse button timer when the left mouse button popup is enabled.

svn path=/trunk/KDE/kdeedu/marble/; revision=1082699

tzapzoor/marble,probonopd/marble,tucnak/marble,tzapzoor/marble,tucnak/marble,tzapzoor/marble,adraghici/marble,probonopd/marble,oberluz/marble,rku/marble,AndreiDuma/marble,Earthwings/marble,rku/marble,AndreiDuma/marble,tucnak/marble,Earthwings/marble,adraghici/marble,AndreiDuma/marble,adraghici/marble,quannt24/marble,utkuaydin/marble,David-Gil/marble-dev,David-Gil/marble-dev,tzapzoor/marble,tzapzoor/marble,probonopd/marble,tzapzoor/marble,probonopd/marble,AndreiDuma/marble,utkuaydin/marble,quannt24/marble,oberluz/marble,David-Gil/marble-dev,adraghici/marble,utkuaydin/marble,tucnak/marble,tzapzoor/marble,probonopd/marble,quannt24/marble,AndreiDuma/marble,oberluz/marble,rku/marble,utkuaydin/marble,probonopd/marble,Earthwings/marble,quannt24/marble,utkuaydin/marble,David-Gil/marble-dev,tucnak/marble,quannt24/marble,AndreiDuma/marble,Earthwings/marble,oberluz/marble,rku/marble,rku/marble,quannt24/marble,quannt24/marble,tucnak/marble,adraghici/marble,tzapzoor/marble,tucnak/marble,utkuaydin/marble,oberluz/marble,probonopd/marble,David-Gil/marble-dev,rku/marble,Earthwings/marble,David-Gil/marble-dev,oberluz/marble,adraghici/marble,Earthwings/marble