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From: ulrich@mips.complang.tuwien.ac.at (Ulrich Neumerkel)
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Subject: How to avoid SPACE TAB in a file?
Date: Wed, 25 Nov 2009 19:25:43 GMT
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
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It occurs to me occasionally that I happen to write SPACE TAB in a buffer
saved into a file.  This is mostly when I edit files with different
tabbing conventions.

Is there are general clean minor-mode or other way to avoid writing
this combination in general?