vim-patch:8.2.3610: crash when ModeChanged triggered too early

Problem:    Crash when ModeChanged triggered too early.
Solution:   Trigger ModeChanged after setting VIsual.
a062006b9d

src/nvim/normal.c

@@ -6789,7 +6789,6 @@ static void n_start_visual_mode(int c)
   VIsual_mode = c;
   VIsual_active = true;
   VIsual_reselect = true;
-  trigger_modechanged();
   // Corner case: the 0 position in a tab may change when going into
   // virtualedit.  Recalculate curwin->w_cursor to avoid bad highlighting.
   //
@@ -6801,6 +6800,7 @@ static void n_start_visual_mode(int c)
 
   foldAdjustVisual();
 
+  trigger_modechanged();
   setmouse();
   // Check for redraw after changing the state.
   conceal_check_cursor_line();

src/nvim/testdir/test_edit.vim

@@ -1727,4 +1727,12 @@ func Test_recursive_ModeChanged()
   au!
 endfunc
 
+func Test_ModeChanged_starts_visual()
+  " This was triggering ModeChanged before setting VIsual, causing a crash.
+  au! ModeChanged * norm 0u
+  sil! norm 
+
+  au! ModeChanged
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab