patch 8.2.4215: illegal memory access when copying lines in Visual mode

Problem:    Illegal memory access when copying lines in Visual mode.
Solution:   Adjust the Visual position after copying lines.

src/ex_cmds.c

@@ -866,6 +866,8 @@ ex_copy(linenr_T line1, linenr_T line2, linenr_T n)
     }
 
     appended_lines_mark(n, count);
+    if (VIsual_active)
+	check_pos(curbuf, &VIsual);
 
     msgmore((long)count);
 }

src/testdir/test_visual.vim

@@ -1328,5 +1328,16 @@ func Test_visual_exchange_windows()
   bwipe!
 endfunc
 
+" this was leaving the end of the Visual area beyond the end of a line
+func Test_visual_ex_copy_line()
+  new
+  call setline(1, ["aaa", "bbbbbbbbbxbb"])
+  /x
+  exe "normal ggvjfxO"
+  t0
+  normal gNU
+  bwipe!
+endfunc
+
 
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4215,
 /**/
     4214,
 /**/