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Making line prefixes invisible to a mode?

From: Raffaele Ricciardi
Subject: Making line prefixes invisible to a mode?
Date: Fri, 05 Jul 2013 21:55:30 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130620 Thunderbird/17.0.7

Hello everyone,

Emacs supports multiple major modes by means of indirect buffers. This
feature is useful - among other things - to edit comments in source
code.  However, when editing a block of line-comments, the
line-comment prefix is seen by the alternative major mode as a part of
the buffer (unless such mode is a specialized mode, of course).
Narrowing can't work, either, because you can't narrow to a rectangle,
can you?  Therefore, is it possible to make a mode "believe" that each
line starts after the line comment prefix?

I have an alternative solution in mind*, but I'd like to know whether
a direct way to achieve this is available.

Thank you.

*: Such solution would involve narrowing to a comment block and then
 stripping the line prefix, only to add it again before widening.

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