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)

src/register.c

@@ -2205,6 +2205,9 @@ error:
 		{
 		    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)

src/testdir/test_put.vim

@@ -126,8 +126,10 @@ func Test_gp_with_count_leaves_cursor_at_end()
   new
   call setline(1, '<---->')
   call setreg('@', "foo\nbar", 'c')
-  exe "normal 1G3|3gpix\<Esc>"
+  normal 1G3|3gp
-  call assert_equal(['<--foo', 'barfoo', 'barfoo', 'barx-->'], getline(1, '$'))
+  call assert_equal([0, 4, 4, 0], getpos("."))
+  call assert_equal(['<--foo', 'barfoo', 'barfoo', 'bar-->'], getline(1, '$'))
+  call assert_equal([0, 4, 3, 0], getpos("']"))
 
   bwipe!
 endfunc

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3455,
 /**/
     3454,
 /**/