patch 8.2.3455: using a count with "gp" leaves '] in wrong position

Problem:    Using a count with "gp" leaves '] in wrong position. (Naohiro Ono)
Solution:   Correct the mark position. (closes #8899)
diff --git a/src/register.c b/src/register.c
index 3ddacb8..f034c64 100644
--- a/src/register.c
+++ b/src/register.c
@@ -2205,6 +2205,9 @@
 		{
 		    curwin->w_cursor.lnum = new_lnum;
 		    curwin->w_cursor.col = col;
+		    curbuf->b_op_end = curwin->w_cursor;
+		    if (col > 1)
+			curbuf->b_op_end.col = col - 1;
 		}
 	    }
 	    else if (y_type == MLINE)