[FR]: Toggle to not show already existing feeds when importing them

[jwkwshjsjsj]

Brief description of the feature request

There should be a toggle to not show already existing feeds when importing them.

[martinrotter]

Can you be more specific on what you actually mean?

[jwkwshjsjsj]

Can you be more specific on what you actually mean?

There should be a toggle to hide feeds that already exist from the list of importable feeds.