EA-53425 (do not suggest casting to null type)
IDEA-121966 Multiple-Cursor Jumpy
(cherry picked from commit ee3f4a5)
IDEA-122068 Unknown plugin error
(cherry picked from commit ac95684)
undo should restore primary caret properly (IDEA-80056)
(cherry picked from commit dfe4e01)
IDEA-121896 Delete key doesn't delete CRLF while using multiple carets
(cherry picked from commit f4985e3)