Flag an error for isolated post-events occuring in music lists

Flag an error for isolated post-events occuring in music lists

These can happen when writing things like

c \tweak #'color #red -3

since at the current point of time a tweaked post-event is not
syntactically recognized as a post-event without leading -, like

c -\tweak #'color #red -3

While this restriction will at some time be removed, in the mean time
we want to have this problem flagged.

[thomasmorley65, 2012-12-13 01:05:28]

Can't review parser-code, but from description:
LGTM

For the sake of easier understanding I'd have given these examples,though, to
show that printing yes/no is more a matter of accident:

% fingering is printed
%\displayMusic 
{ \tweak #'color #red -3 c }

% fingering is not printed	
%\displayMusic 
{ c \tweak #'color #red -3 }

[dak, 2012-12-19 02:52:12]

On 2012/12/13 01:05:28, thomasmorley65 wrote:
> Can't review parser-code, but from description:
> LGTM
> 
> For the sake of easier understanding I'd have given these examples,though, to
> show that printing yes/no is more a matter of accident:
> 
> % fingering is printed
> %\displayMusic 
> { \tweak #'color #red -3 c }
> 
> % fingering is not printed	
> %\displayMusic 
> { c \tweak #'color #red -3 }

Sorry, I just noticed after pushing that I had not addressed this comment.  I
don't quite agree with its sentiment: in either case, the fingering gets to be
printed basically (if there are other music events simultaneously, which does
not happen in the second example just because the -3 comes last).  But in either
case, the timing is quite weird, and the resulting music list defective.

Now this should have been discussed and consent reached before pushing.  I am
sorry that I bungled this, but as it only concerns the commit message, it would
seem exaggerated to try rewinding staging just for the chance that we would
arrive at a different opinion about the commit message text.

[dak, 2012-12-19 11:57:17]

Fix bad examples in doc before committing checks

[Trevor Daniels, 2012-12-19 12:11:25]

LGTM

Trevor

[dak, 2012-12-19 17:33:59]

Fix overlooked old code in French tweaking documentation