Scope to slur when adding slur

[craigsapp]

When adding a slur, such as when typing s while focused on a note, the scope is shifted to the last note of the slur rather than the slur. It should be put on the slur.

[craigsapp]

Fixed with commit 041e438

Interactions done:

(1) click on second note (D4)
(2) type 4s to add a slur that extends to the 4th note after the current note.
(3) press the right arrow to move the left end of the slur
(4) press shift-right arrow to move the right end of the slur
(5) then doing some more moving and pressing a and b to force the slur above/below the staff.

[craigsapp]

Needs to be fixed again

[craigsapp]

Or more precisely, when editing a slur, moving the start of the slur behaves correctly, with the slur remaining in focus. But when moving the ending of the slur, the focus on the slur is lost.