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When there are no devices, the list doesn't display the "Searching for devices..." placeholder. Instead, a broken GtkListBox is shown. Fix that by using a GtkListBox placeholder to show the "Searching for devices..." message. Closes #113
When there are no devices, the list doesn't display the "Searching for devices..." placeholder. Instead, a broken GtkListBox is shown. Fix that by using a GtkListBox placeholder to show the "Searching for devices..." message. Closes #113