[443314] move cursor into substructure when moving down

This is again a one-off problem. Unfortunately AbstractBlockBox and
BlockElementBox add 1 to the start offset of the associated node (in
getStartOffset()). Fixing that breaks a lot of other cases. Instead, the
offset of the first inner caret position was corrected here.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=443314
Change-Id: I727ececa571570446f7e074cdd704113a5709155
Signed-off-by: Florian Thienel <florian@thienel.org>
2 files changed