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What is a "superior mode"?


From: Marcin Borkowski
Subject: What is a "superior mode"?
Date: Tue, 09 Mar 2021 05:54:45 +0100
User-agent: mu4e 1.1.0; emacs 28.0.50

Hi all,

the Elisp reference says (in the "Mode-Specific Indent" node):

 -- Function: prog-first-column
     Call this function instead of using a literal value (usually, zero)
     of the column number for indenting top-level program constructs.
     The function’s value is the column number to use for top-level
     constructs.  When no superior mode is in effect, this function
     returns zero.

What is a "superior mode" (and a "sub-mode", for that matter)?

TIA,

-- 
Marcin Borkowski
http://mbork.pl



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