[luatex] protect_glyph

[Patrick Gundlach]

Am 04.07.2011 um 12:01 schrieb luigi scarso:

> On Mon, Jul 4, 2011 at 11:50 AM, Patrick Gundlach <patrick at gundla.ch> wrote:
>> Hi,
>> 
>> why is the function protect_glyph called "protect..."? What does it protect?
>> 
>> Patrick
>> 
>> 
>> (who is slightly embarrassed to ask this question)
>> 
>> 
> (a little old trunk/source/texk/web2c/luatexdir/lua/lnodelib.c)
> 
> static int lua_nodelib_protect_glyphs(lua_State * L)
[...]
> static int lua_nodelib_unprotect_glyphs(lua_State * L)
[...]

I still don't quite understand what it protects from? The source and the manual are stating the same, so I am not sure what I can read from the source.

Patrick