patch 8.2.3517: TextChanged does not trigger after TextChangedI

Problem:    TextChanged does not trigger after TextChangedI.
Solution:   Store the tick separately for TextChangedI. (Christian Brabandt,
            closes #8968, closes #8932)

src/buffer.c

@@ -327,6 +327,7 @@ open_buffer(
     // Set last_changedtick to avoid triggering a TextChanged autocommand right
     // after it was added.
     curbuf->b_last_changedtick = CHANGEDTICK(curbuf);
+    curbuf->b_last_changedtick_i = CHANGEDTICK(curbuf);
     curbuf->b_last_changedtick_pum = CHANGEDTICK(curbuf);
 
     // require "!" to overwrite the file, because it wasn't read completely

src/bufwrite.c

@@ -2422,8 +2422,8 @@ restore_backup:
 	    && (overwriting || vim_strchr(p_cpo, CPO_PLUS) != NULL))
     {
 	unchanged(buf, TRUE, FALSE);
-	// b:changedtick is may be incremented in unchanged() but that
-	// should not trigger a TextChanged event.
+	// b:changedtick may be incremented in unchanged() but that should not
+	// trigger a TextChanged event.
 	if (buf->b_last_changedtick + 1 == CHANGEDTICK(buf))
 	    buf->b_last_changedtick = CHANGEDTICK(buf);
 	u_unchanged(buf);

src/edit.c

@@ -1477,9 +1477,9 @@ ins_redraw(int ready)	    // not busy with something
 	last_cursormoved = curwin->w_cursor;
     }
 
-    // Trigger TextChangedI if b_changedtick differs.
+    // Trigger TextChangedI if b_changedtick_i differs.
     if (ready && has_textchangedI()
-	    && curbuf->b_last_changedtick != CHANGEDTICK(curbuf)
+	    && curbuf->b_last_changedtick_i != CHANGEDTICK(curbuf)
 	    && !pum_visible())
     {
 	aco_save_T	aco;
@@ -1489,15 +1489,15 @@ ins_redraw(int ready)	    // not busy with something
 	aucmd_prepbuf(&aco, curbuf);
 	apply_autocmds(EVENT_TEXTCHANGEDI, NULL, NULL, FALSE, curbuf);
 	aucmd_restbuf(&aco);
-	curbuf->b_last_changedtick = CHANGEDTICK(curbuf);
+	curbuf->b_last_changedtick_i = CHANGEDTICK(curbuf);
 	if (tick != CHANGEDTICK(curbuf))  // see ins_apply_autocmds()
 	    u_save(curwin->w_cursor.lnum,
 					(linenr_T)(curwin->w_cursor.lnum + 1));
     }
 
-    // Trigger TextChangedP if b_changedtick differs. When the popupmenu closes
-    // TextChangedI will need to trigger for backwards compatibility, thus use
-    // different b_last_changedtick* variables.
+    // Trigger TextChangedP if b_changedtick_pum differs. When the popupmenu
+    // closes TextChangedI will need to trigger for backwards compatibility,
+    // thus use different b_last_changedtick* variables.
     if (ready && has_textchangedP()
 	    && curbuf->b_last_changedtick_pum != CHANGEDTICK(curbuf)
 	    && pum_visible())

src/structs.h

@@ -2701,10 +2701,10 @@ struct file_buffer
 				// incremented for each change, also for undo
 #define CHANGEDTICK(buf) ((buf)->b_ct_di.di_tv.vval.v_number)
 
-    varnumber_T	b_last_changedtick; // b:changedtick when TextChanged or
-				    // TextChangedI was last triggered.
-    varnumber_T	b_last_changedtick_pum; // b:changedtick when TextChangedP was
+    varnumber_T	b_last_changedtick;	// b:changedtick when TextChanged was
 					// last triggered.
+    varnumber_T	b_last_changedtick_pum; // b:changedtick for TextChangedP
+    varnumber_T	b_last_changedtick_i;   // b:changedtick for TextChangedI
 
     int		b_saving;	// Set to TRUE if we are in the middle of
 				// saving the buffer.

src/testdir/test_autocmd.vim

@@ -1929,6 +1929,7 @@ func Test_ChangedP()
     let g:autocmd .= a:char
   endfunc
 
+  " TextChanged will not be triggered, only check that it isn't.
   au! TextChanged <buffer> :call TextChangedAutocmd('N')
   au! TextChangedI <buffer> :call TextChangedAutocmd('I')
   au! TextChangedP <buffer> :call TextChangedAutocmd('P')
@@ -2863,5 +2864,42 @@ func Test_autocmd_with_block()
   augroup END
 endfunc
 
+" Test TextChangedI and TextChanged
+func Test_Changed_ChangedI()
+  new
+  call test_override("char_avail", 1)
+  let [g:autocmd_i, g:autocmd_n] = ['','']
+
+  func! TextChangedAutocmdI(char)
+    let g:autocmd_{tolower(a:char)} = a:char .. b:changedtick
+  endfunc
+
+  augroup Test_TextChanged
+    au!
+    au TextChanged  <buffer> :call TextChangedAutocmdI('N')
+    au TextChangedI <buffer> :call TextChangedAutocmdI('I')
+  augroup END
+
+  call feedkeys("ifoo\<esc>", 'tnix')
+  " TODO: Test test does not seem to trigger TextChanged autocommand, this
+  " requires running Vim in a terminal window.
+  " call assert_equal('N3', g:autocmd_n)
+  call assert_equal('I3', g:autocmd_i)
+
+  call feedkeys("yyp", 'tnix')
+  " TODO: Test test does not seem to trigger TextChanged autocommand.
+  " call assert_equal('N4', g:autocmd_n)
+  call assert_equal('I3', g:autocmd_i)
+
+  " CleanUp
+  call test_override("char_avail", 0)
+  au! TextChanged  <buffer>
+  au! TextChangedI <buffer>
+  augroup! Test_TextChanged
+  delfu TextChangedAutocmdI
+  unlet! g:autocmd_i g:autocmd_n
+
+  bw!
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3517,
 /**/
     3516,
 /**/