I would like to use the Bing picture of the day as a background image on the lock screen. In the dialog where you can configure the lockscreen background, there is a dropdown available allowing to select the 'Picture of the day' provider. But when I do so, there is no provider list shown. There is a Text field which says something like: Choose Provider, but there is no pull-down shown by the side. For the moment I would already be happy to know how to configure it manually in the relevant configuration file. I am on the latest released version of Plasma.