patch 8.2.3564: invalid memory access when scrolling without valid screen

Problem:    Invalid memory access when scrolling without a valid screen.
Solution:   Do not set VALID_BOTLINE in w_valid.

src/move.c

@@ -199,7 +199,6 @@ update_topline(void)
 	check_cursor_lnum();
 	curwin->w_topline = curwin->w_cursor.lnum;
 	curwin->w_botline = curwin->w_topline;
-	curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
 	curwin->w_scbind_pos = 1;
 	return;
     }

src/testdir/test_normal.vim

@@ -987,6 +987,22 @@ func Test_vert_scroll_cmds()
   close!
 endfunc
 
+func Test_scroll_in_ex_mode()
+  " This was using invalid memory because w_botline was invalid.
+  let lines =<< trim END
+      diffsplit
+      norm os00(
+      call writefile(['done'], 'Xdone')
+      qa!
+  END
+  call writefile(lines, 'Xscript')
+  call assert_equal(1, RunVim([], [], '--clean -X -Z -e -s -S Xscript'))
+  call assert_equal(['done'], readfile('Xdone'))
+
+  call delete('Xscript')
+  call delete('Xdone')
+endfunc
+
 " Test for the 'sidescroll' option
 func Test_sidescroll_opt()
   new

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3564,
 /**/
     3563,
 /**/