Feature Request: Dim filenames in "New Filename" if unchanged

As simple as the title says.
Dimming or graying the filenames in the New Filename column is very useful, especially if you are using RegEx with long filenames.

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Reply to #1:
I already have the feature request on my todo list but unfortunately it has proven more difficult to do than first expected. I expect to do it at some point but there are other tasks that have higher priority.

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