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Date: Sun, 31 Jul 2016 12:20:57 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-help] An other Question
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> 1. Wich file is search to manipulate fore... ?
> 2. Is there a known construct to modify the Layer-parameter?
> 3. Is there a known construct to modify the Menu-Entry?

If you're digging into the code, geda-user is probably a better forum,
but...

The layer grouping itself is in src/globa.h as LayerGroupType.

A search for "LayerGroups" (case sensitive) in src/*.c will
show you everywhere it's used... it's a lot :-)

misc.c is probably the best starting point, where the functions that
manipulate it are.

The menus are handled separately by the various GUIs (src/hid/gtk and
src/hid/lesstif).