Is there a programmer's text editor for OS X with narrowing?

I think the title is essentially self-explanatory except for a necessary clarification and caveat:

Clarification

I'm not entirely sure if 'narrowing' is the universal term for the 开发者_如何学编程feature I'm referring to. What I mean is something like Emacs' 'narrow buffer', ie. the ability to select a region and quickly narrow the editor window to show only that region, and then after some edits to be able to quickly zoom out to see/edit the full file again. It's a feature I like, and find far more useful than code folding.

Caveat

Of course the answer is 'yes -- (X)Emacs' (and possibly vim?). But I'm looking for something other than vim or Emacs; almost certainly a more GUIsh one (think Textmate, TextWrangler etc).

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My researches seem to suggest that the straightest answer is just 'no'. I haven't been able to find an editor that runs on OS X that supports narrowing, other than emacs.

I have however figured out a workaround that might be of interest for some scenarios, which is to use Hog Bay Software's QuickCursor in conjunction with one or more editors.

For example, I've tried setting up QuickCursor to fire up TextMate. So now when working in XCode, I can select the text I want to narrow to, hit the global hotkey I have set up, and the selected text pops up in a TextMate window. That can be edited, then a save and dismiss window pops the edited text back in XCode.

This also works if you're just working in TextMate (or, I imagine, one of the other editors that QuickCursor can control); ie. you can select select test in the editor, trigger QuickCursor to open the selected text in a new window, and later pop that text back to the original window.

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I'm guessing this is not what you want, but you didn't specifically say so: Aquamacs? It's an emacsen with good integration with OS X (cut, paste, menus, toolbars, etc).