solid background for text signs

[Matevz Jekovec]

I suggest the following new feature.

As seen in many sources (currently looking at Henle urtext Chopin's 
Etudes), expression text signs (cresc., ritardando, sotto voce...) have 
solid white background, so the bar lines don't mix up with them. 
Usually, we can avoid hitting a slur, a stem or a dynamic marking, but 
hardly a bar line. IMO, this shouldn't be a default setting for all the 
text signs now (sometimes, a short pin of a note beam won't do any harm 
to a large /fortissimo/ sign), but should allow being optional.

I attached a scanned part of the Chopin's Etude op.25 no.2. Notice the 
/molto legato/ sign.


- Matevz