vim-patch:partial:9.0.0913: only change in current window triggers the WinScrolled event

Problem:    Only a change in the current window triggers the WinScrolled
            event.
Solution:   Trigger WinScrolled if any window scrolled or changed size.
            (issue vim/vim#11576)

0a60f79fd0

Skip locking of window layout and E1312.
Copy the latest version of all WinScrolled tests from Vim.
Note: patch 9.0.0915 is needed for the Lua tests to pass.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

test/functional/autocmd/winscrolled_spec.lua

@@ -1,8 +1,10 @@
 local helpers = require('test.functional.helpers')(after_each)
+local Screen = require('test.functional.ui.screen')
 
 local clear = helpers.clear
 local eq = helpers.eq
 local eval = helpers.eval
+local exec = helpers.exec
 local command = helpers.command
 local feed = helpers.feed
 local meths = helpers.meths
@@ -89,11 +91,42 @@ describe('WinScrolled', function()
   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()
+describe('WinScrolled', function()
+  -- oldtest: Test_WinScrolled_mouse()
+  it('is triggered by mouse scrolling in another window', function()
+    local screen = Screen.new(75, 10)
+    screen:attach()
+    exec([[
+      set nowrap scrolloff=0
+      set mouse=a
+      call setline(1, ['foo']->repeat(32))
+      split
+      let g:scrolled = 0
+      au WinScrolled * let g:scrolled += 1
+    ]])
+
+    -- With the upper split focused, send a scroll-down event to the unfocused one.
+    meths.input_mouse('wheel', 'down', '', 0, 6, 0)
+    eq(1, eval('g:scrolled'))
+
+    -- Again, but this time while we're in insert mode.
+    feed('i')
+    meths.input_mouse('wheel', 'down', '', 0, 6, 0)
+    feed('<Esc>')
+    eq(2, eval('g:scrolled'))
+  end)
+
+  -- oldtest: Test_WinScrolled_close_curwin()
+  it('closing window does not cause use-after-free #13265', function()
+    exec([[
+      set nowrap scrolloff=0
+      call setline(1, ['aaa', 'bbb'])
+      vsplit
+      au WinScrolled * close
+    ]])
+
+    -- This was using freed memory
+    feed('<C-E>')
+    assert_alive()
+  end)
 end)