(qt) #5252 'file-renaming issues in Qt client': hide invisible columns in file-tree

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13929 f4695dd4-2c0a-0410-b89c-da849a56a58e
(qt) #5252 'file-renaming issues in Qt client': fix renaming flicker error reported by rb07

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13930 f4695dd4-2c0a-0410-b89c-da849a56a58e