if(KMessageBox::warningContinueCancel(this,i18n("Deleting these preview files will invalidate all timeline previews for this project."))!=KMessageBox::Continue)return;
if(KMessageBox::warningContinueCancel(this,i18n("Deleting the project preview files in this folder will invalidate all timeline previews:\n%1",m_previewDir.absolutePath()))!=KMessageBox::Continue)return;