vim-patch:9.0.0756 #20680

Problem:    No autocmd event for changing text in a terminal window.
Solution:   Add TextChangedT. (Shougo Matsushita, closes vim/vim#11366)

4ccaedfcd7

runtime/doc/autocmd.txt

@@ -996,6 +996,10 @@ TextChangedP			After a change was made to the text in the
 				current buffer in Insert mode, only when the
 				popup menu is visible.  Otherwise the same as
 				TextChanged.
+							*TextChangedT*
+TextChangedT			After a change was made to the text in the
+				current buffer in |Terminal-mode|.  Otherwise
+				the same as TextChanged.
 							*TextYankPost*
 TextYankPost			Just after a |yank| or |deleting| command, but not
 				if the black hole register |quote_| is used nor

src/nvim/auevents.lua

@@ -108,6 +108,7 @@ return {
     'TextChanged',            -- text was modified
     'TextChangedI',           -- text was modified in Insert mode(no popup)
     'TextChangedP',           -- text was modified in Insert mode(popup)
+    'TextChangedT',           -- text was modified in Terminal mode
     'TextYankPost',           -- after a yank or delete was done (y, d, c)
     'UIEnter',                -- after UI attaches
     'UILeave',                -- after UI detaches

src/nvim/terminal.c

@@ -523,6 +523,18 @@ static int terminal_check(VimState *state)
 
   if (must_redraw) {
     update_screen();
+
+    // Make sure an invoked autocmd doesn't delete the buffer (and the
+    // terminal) under our fingers.
+    curbuf->b_locked++;
+
+    // save and restore curwin and curbuf, in case the autocmd changes them
+    aco_save_T aco;
+    aucmd_prepbuf(&aco, curbuf);
+    apply_autocmds(EVENT_TEXTCHANGEDT, NULL, NULL, false, curbuf);
+    aucmd_restbuf(&aco);
+
+    curbuf->b_locked--;
   }
 
   if (need_maketitle) {  // Update title in terminal-mode. #7248

test/functional/terminal/buffer_spec.lua

@@ -410,6 +410,14 @@ describe('on_lines does not emit out-of-bounds line indexes when', function()
     feed_command('bdelete!')
     eq('', exec_lua([[return _G.cb_error]]))
   end)
+
+  it('runs TextChangedT event', function()
+    meths.set_var('called', 0)
+    command('autocmd TextChangedT * ++once let g:called = 1')
+    feed_command('terminal')
+    feed('iaa')
+    eq(1, meths.get_var('called'))
+  end)
 end)
 
 it('terminal truncates number of composing characters to 5', function()