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Add --error-if-unmodified option

From: Florian Schmaus
Subject: Add --error-if-unmodified option
Date: Tue, 5 Jul 2022 11:13:26 +0200

As the motiviation in the commit message states, we would like to be able to 
detect sed invokations that became no-ops. So this is my first attempt in 
adding support to signal this case with a dedicated exit status.

Since this is my first time working with sed's codebase, I may have
missed some cases where the input is mutated. Hence I am looking
forward to your feedback and would be happy if such a functionaly
could be considered for inclusion. :)

- Flow

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