Auto-Completion's Dependency Problem

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This diagram shows the dependencies of mutt_enter_string().

• Names are shortened to save space
• (6) denotes six callers that may not be shown

Auto-completion is a mess.
Most callers simply want a string in return.
Others want a file, or multiple files, or a mailbox.
In order to accommodate these uses, mutt_enter_string() takes parameters to satisfy them all.

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Superseded by: #3955 Neomutt completion API