
Fix two bugs with drag and drop related to split pane. Switch using the scrolled element for position calculations and reset the scrolled element when switching back to non-split mode.

R=eae,moedinger,pupius
DELTA=29  (15 added, 3 deleted, 11 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=645


git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@718 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

johan/closure-library,johan/closure-library,johan/closure-library