Merge pull request #23288 from MunifTanjim/issue-22263

fix(normal): fix repeated trigger modechanged for scheduled callback

src/nvim/normal.c

@@ -956,10 +956,12 @@ normal_end:
     set_reg_var(get_default_register_name());
   }
 
-  // Reset finish_op, in case it was set
   s->c = finish_op;
-  finish_op = false;
+  if (s->oa.op_type == OP_NOP) {
-  may_trigger_modechanged();
+    // Reset finish_op, in case it was set
+    finish_op = false;
+    may_trigger_modechanged();
+  }
   // Redraw the cursor with another shape, if we were in Operator-pending
   // mode or did a replace command.
   if (s->c || s->ca.cmdchar == 'r'
@@ -1729,9 +1731,9 @@ void prep_redo_num2(int regname, long num1, int cmd1, int cmd2, long num2, int c
   }
 }
 
-/// check for operator active and clear it
+/// Check for operator active and clear it.
 ///
-/// @return  true if operator was active
+/// Beep and return true if an operator was active.
 static bool checkclearop(oparg_T *oap)
 {
   if (oap->op_type == OP_NOP) {
@@ -1743,7 +1745,7 @@ static bool checkclearop(oparg_T *oap)
 
 /// Check for operator or Visual active.  Clear active operator.
 ///
-/// @return  true if operator or Visual was active.
+/// Beep and return true if an operator or Visual was active.
 static bool checkclearopq(oparg_T *oap)
 {
   if (oap->op_type == OP_NOP && !VIsual_active) {

test/functional/autocmd/modechanged_spec.lua

@@ -1,17 +1,19 @@
 local helpers = require('test.functional.helpers')(after_each)
 local clear, eval, eq = helpers.clear, helpers.eval, helpers.eq
 local feed, command = helpers.feed, helpers.command
+local exec_lua = helpers.exec_lua
 
 describe('ModeChanged', function()
   before_each(function()
     clear()
-    command('let g:count = 0')
-    command('au ModeChanged * let g:event = copy(v:event)')
-    command('au ModeChanged * let g:count += 1')
   end)
 
   it('picks up terminal mode changes', function()
-    command("term")
+    command('let g:count = 0')
+    command('au ModeChanged * let g:event = copy(v:event)')
+    command('au ModeChanged * let g:count += 1')
+
+    command('term')
     feed('i')
     eq({
       old_mode = 'nt',
@@ -28,4 +30,35 @@ describe('ModeChanged', function()
     -- v:event is cleared after the autocommand is done
     eq({}, eval('v:event'))
   end)
+
+  it('does not repeatedly trigger for scheduled callback', function()
+    exec_lua([[
+      vim.g.s_count = 0
+      vim.g.s_mode = ""
+      vim.g.t_count = 0
+      vim.g.t_mode = ""
+      vim.api.nvim_create_autocmd("ModeChanged", {
+        callback = function()
+          vim.g.s_count = vim.g.s_count + 1
+          vim.g.s_mode = vim.api.nvim_get_mode().mode
+          vim.schedule(function()
+            vim.g.t_count = vim.g.t_count + 1
+            vim.g.t_mode = vim.api.nvim_get_mode().mode
+          end)
+        end,
+      })
+    ]])
+
+    feed('d')
+    eq(1, eval('g:s_count'))
+    eq('no', eval('g:s_mode'))
+    eq(1, eval('g:t_count'))
+    eq('no', eval('g:t_mode'))
+
+    feed('<Esc>')
+    eq(2, eval('g:s_count'))
+    eq('n', eval('g:s_mode'))
+    eq(2, eval('g:t_count'))
+    eq('n', eval('g:t_mode'))
+  end)
 end)

test/old/testdir/test_autocmd.vim

@@ -3453,7 +3453,7 @@ endfunc
 " Test for ModeChanged pattern
 func Test_mode_changes()
   let g:index = 0
-  let g:mode_seq = ['n', 'i', 'n', 'v', 'V', 'i', 'ix', 'i', 'ic', 'i', 'n', 'no', 'n', 'V', 'v', 's', 'n']
+  let g:mode_seq = ['n', 'i', 'n', 'v', 'V', 'i', 'ix', 'i', 'ic', 'i', 'n', 'no', 'noV', 'n', 'V', 'v', 's', 'n']
   func! TestMode()
     call assert_equal(g:mode_seq[g:index], get(v:event, "old_mode"))
     call assert_equal(g:mode_seq[g:index + 1], get(v:event, "new_mode"))
@@ -3464,7 +3464,7 @@ func Test_mode_changes()
   au ModeChanged * :call TestMode()
   let g:n_to_any = 0
   au ModeChanged n:* let g:n_to_any += 1
-  call feedkeys("i\<esc>vVca\<CR>\<C-X>\<C-L>\<esc>ggdG", 'tnix')
+  call feedkeys("i\<esc>vVca\<CR>\<C-X>\<C-L>\<esc>ggdV\<MouseMove>G", 'tnix')
 
   let g:V_to_v = 0
   au ModeChanged V:v let g:V_to_v += 1