Doc: Accidental style clarification

[Ole Vedel Villumsen]

In order further to clarify the subsection "Automatic accidentals" of section 
1.1.3 Displaying pitches of NR: Please extend the initial description of scope; 
after the input \accidentalStyle #'StaffGroup "voice" (all references are to 
the v2.15 docs), please insert:

Before setting accidental style in more than one scope (for example by using 
\accidentalStyle "piano" and \accidentalStyle "default" in the same piano 
staff), be aware that the function sets a property in the relevant scope and 
that the interplay between properties in different scopes follows the rules in 
section 3.3.4 Modifying context properties of the LM and in section 5.3 
Modifying properties of NR.

I trust you to insert the relevant links to the other documentation mentioned.

My suggestion follows the discussion in the thread "Switcing accidental style 
doesn't always work" on gmane.comp.gnu.lilypond.bugs between July 4 and 8 2011 
(in which I don’t blame the bug squad for not immediately seeing through the 
matter; instead I advocate clarifying the docs as propsed, in the interest of 
all). Since I am not subscribed to bug-lilypond, please consider cc'ing me on 
any follow-up. Thanks.

Your sincere and helpful user,
Ole Villumsen


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