It is very easy to delete a song. (I know there is an are you sure? check).
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I suggest a recycle option is added.
However to keep the code and interface unchanged, I propose that whenever a song is deleted, a copy is automatically exported to a "recycle" folder.
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If a song needs to be recovered, then users can simply import the song from that folder.
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No management of recycled songs needs to be done in OpenLP - users can tidy it up from time to time.
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Hope this makes sense.