For each operation, stop the blinking cursor before acting and restart it _after_...

For each operation, stop the blinking cursor before acting and restart it _after_ redrawing. This latter fixes the spurious cursor jumps in mathed. This was due to the fact that MathArray are filled-in at draw time (as opposed to text positions in the CoordCache which are filled in at metrics calculation time.)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@17033 a592a061-630c-0410-9148-cb99ea01b6c8