Slur beginning on last note of system appears not to extent
1. Open score: //musescore.org/sites/musescore.org/files/issues/11bugs.mscz
2. click the last middle C quarter note at the end of the first system, trumpet part
3. hit "S"
4. hit right cursor
Result: slur is extended graphically (only)
Expected result: slur is extended to the next note
Workaround: select the tail end of the slur on the next system and double click that
Normally, slur can be extended immediately upon entry, but not if the first note of the slur is the last note of a system.