Fix: Cursor can be at an invalid offset in EditText.

"getLineEnd(line) - 1" is used as the return value when the
"horiz" is beyond the line end for multiple line text.
In this case, the returned value can point an invalid
offset like the middle point of a surrogate pair.

Bug: 23069901
Change-Id: I1afef7205a15079a42bb0018df73f70fe9ada862
(cherry picked from commit 00ad16d1cd24b788262ab4f62935e720a392da6d)
1 file changed