vim-patch:8.2.4739: accessing freed memory after WinScrolled autocmd event (#18090)

Problem:    Accessing freed memory after WinScrolled autocmd event.
Solution:   Check the window pointer is still valid. (closes vim/vim#10156)
            Remove the argument from may_trigger_winscrolled().
d58862d18f

test/functional/autocmd/winscrolled_spec.lua

@@ -6,12 +6,14 @@ local eval = helpers.eval
 local command = helpers.command
 local feed = helpers.feed
 local meths = helpers.meths
+local assert_alive = helpers.assert_alive
+
+before_each(clear)
 
 describe('WinScrolled', function()
   local win_id
 
   before_each(function()
-    clear()
     win_id = meths.get_current_win().id
     command(string.format('autocmd WinScrolled %d let g:matched = v:true', win_id))
     command('let g:scrolled = 0')
@@ -72,3 +74,12 @@ describe('WinScrolled', function()
     eq(1, eval('g:scrolled'))
   end)
 end)
+
+it('closing window in WinScrolled does not cause use-after-free #13265', function()
+  local lines = {'aaa', 'bbb'}
+  meths.buf_set_lines(0, 0, -1, true, lines)
+  command('vsplit')
+  command('autocmd WinScrolled * close')
+  feed('<C-E>')
+  assert_alive()
+end)