Don't crash occasionally, when switching folders. Seems, the items are sometimes resorted, while QListView::clear is in progress.
Don't crash occasionally, when switching folders. Seems, the items are
sometimes resorted, while QListView::clear is in progress.

svn path=/trunk/kdenetwork/kmail/; revision=126184

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