fix(events): avoid unnecessary CursorMoved (#24675)

Problem:    Temporarily changing current window in a script causes
            CursorMoved to be triggerd.
Solution:   Don't trigger CursorMoved if neither curwin nor cursor
            changed between two checks.

1 files changed, 25 insertions, 14 deletions

diff --git a/test/functional/autocmd/cursormoved_spec.lua b/test/functional/autocmd/cursormoved_spec.lua
index 64b63c3205..854e14b088 100644
--- a/test/functional/autocmd/cursormoved_spec.lua
+++ b/test/functional/autocmd/cursormoved_spec.lua
@@ -3,7 +3,7 @@ local helpers = require('test.functional.helpers')(after_each)
 local clear = helpers.clear
 local eq = helpers.eq
 local eval = helpers.eval
-local funcs = helpers.funcs
+local meths = helpers.meths
 local source = helpers.source
 local command = helpers.command
 
@@ -12,10 +12,10 @@ describe('CursorMoved', function()
 
   it('is triggered after BufEnter when changing or splitting windows #11878 #12031', function()
     source([[
-    call setline(1, 'foo')
-    let g:log = []
-    autocmd BufEnter * let g:log += ['BufEnter' .. expand("<abuf>")]
-    autocmd CursorMoved * let g:log += ['CursorMoved' .. expand("<abuf>")]
+      call setline(1, 'foo')
+      let g:log = []
+      autocmd BufEnter * let g:log += ['BufEnter' .. expand("<abuf>")]
+      autocmd CursorMoved * let g:log += ['CursorMoved' .. expand("<abuf>")]
     ]])
     eq({}, eval('g:log'))
     command('new')
@@ -24,23 +24,34 @@ describe('CursorMoved', function()
     eq({'BufEnter2', 'CursorMoved2', 'BufEnter1', 'CursorMoved1'}, eval('g:log'))
   end)
 
+  it('is not triggered by temporarily switching window', function()
+    source([[
+      let g:cursormoved = 0
+      vnew
+      autocmd CursorMoved * let g:cursormoved += 1
+    ]])
+    command('wincmd w | wincmd p')
+    eq(0, eval('g:cursormoved'))
+  end)
+
   it("is not triggered by functions that don't change the window", function()
     source([[
-    let g:cursormoved = 0
-    let g:buf = bufnr('%')
-    vsplit foo
-    autocmd CursorMoved * let g:cursormoved += 1
-    call nvim_buf_set_lines(g:buf, 0, -1, v:true, ['aaa'])
+      let g:cursormoved = 0
+      let g:buf = bufnr('%')
+      vsplit foo
+      autocmd CursorMoved * let g:cursormoved += 1
     ]])
-    eq({'aaa'}, funcs.nvim_buf_get_lines(eval('g:buf'), 0, -1, true))
+    meths.buf_set_lines(eval('g:buf'), 0, -1, true, {'aaa'})
+    eq(0, eval('g:cursormoved'))
+    eq({'aaa'}, meths.buf_get_lines(eval('g:buf'), 0, -1, true))
     eq(0, eval('g:cursormoved'))
   end)
 
   it("is not triggered by cursor movement prior to first CursorMoved instantiation", function()
     source([[
-    let g:cursormoved = 0
-    autocmd! CursorMoved
-    autocmd CursorMoved * let g:cursormoved += 1
+      let g:cursormoved = 0
+      autocmd! CursorMoved
+      autocmd CursorMoved * let g:cursormoved += 1
     ]])
     eq(0, eval('g:cursormoved'))
   end)