Move the iterator a given number of characters visually, treating
it as the strong cursor position. If count is positive, then the
new strong cursor position will be count positions to the right of
the old cursor position. If count is negative then the new strong
cursor position will be count positions to the left of the old
cursor position.
In the presence of bi-directional text, the correspondence
between logical and visual order will depend on the direction
of the current run, and there may be jumps when the cursor
is moved off of the end of a run.
Move the iterator a given number of characters visually, treating it as the strong cursor position. If count is positive, then the new strong cursor position will be count positions to the right of the old cursor position. If count is negative then the new strong cursor position will be count positions to the left of the old cursor position. In the presence of bi-directional text, the correspondence between logical and visual order will depend on the direction of the current run, and there may be jumps when the cursor is moved off of the end of a run.