Merge #2674

src/nvim/edit.c

@@ -2464,6 +2464,14 @@ void ins_compl_show_pum(void)
     /* Need to build the popup menu list. */
     compl_match_arraysize = 0;
     compl = compl_first_match;
+    /*
+     * If it's user complete function and refresh_always,
+     * not use "compl_leader" as prefix filter.
+     */
+    if (ins_compl_need_restart()){
+      xfree(compl_leader);
+      compl_leader = NULL;
+    }
     if (compl_leader != NULL)
       lead_len = (int)STRLEN(compl_leader);
     do {
@@ -2932,11 +2940,9 @@ static void ins_compl_new_leader(void)
   else {
     spell_bad_len = 0;          /* need to redetect bad word */
     /*
-     * Matches were cleared, need to search for them now.  First display
-     * the changed text before the cursor.  Set "compl_restarting" to
-     * avoid that the first match is inserted.
+     * Matches were cleared, need to search for them now.
+     * Set "compl_restarting" to avoid that the first match is inserted.
      */
-    update_screen(0);
     compl_restarting = TRUE;
     if (ins_complete(Ctrl_N) == FAIL)
       compl_cont_status = 0;
@@ -2948,8 +2954,9 @@ static void ins_compl_new_leader(void)
   /* Show the popup menu with a different set of matches. */
   ins_compl_show_pum();
 
-  /* Don't let Enter select the original text when there is no popup menu. */
-  if (compl_match_array == NULL)
+  /* Don't let Enter select the original text when there is no popup menu.
+   * Don't let Enter select when use user function and refresh_always is set */
+  if (compl_match_array == NULL || ins_compl_need_restart())
     compl_enter_selects = FALSE;
 }
 
@@ -2980,28 +2987,19 @@ static void ins_compl_addleader(int c)
     (*mb_char2bytes)(c, buf);
     buf[cc] = NUL;
     ins_char_bytes(buf, cc);
-    if (compl_opt_refresh_always)
-      AppendToRedobuff(buf);
   } else {
     ins_char(c);
-    if (compl_opt_refresh_always)
-      AppendCharToRedobuff(c);
   }
 
   /* If we didn't complete finding matches we must search again. */
   if (ins_compl_need_restart())
     ins_compl_restart();
 
-  /* When 'always' is set, don't reset compl_leader. While completing,
-   * cursor doesn't point original position, changing compl_leader would
-   * break redo. */
-  if (!compl_opt_refresh_always) {
   xfree(compl_leader);
   compl_leader = vim_strnsave(get_cursor_line_ptr() + compl_col,
       (int)(curwin->w_cursor.col - compl_col));
   ins_compl_new_leader();
 }
-}
 
 /*
  * Setup for finding completions again without leaving CTRL-X mode.  Used when
@@ -3009,6 +3007,10 @@ static void ins_compl_addleader(int c)
  */
 static void ins_compl_restart(void)
 {
+  /* update screen before restart.
+   * so if complete is blocked,
+   * will stay to the last popup menu and reduce flicker */
+  update_screen(0);
   ins_compl_free();
   compl_started = FALSE;
   compl_matches = 0;

test/functional/viml/completion_spec.lua

@@ -2,7 +2,7 @@
 local helpers = require('test.functional.helpers')
 local clear, feed = helpers.clear, helpers.feed
 local eval, eq, neq = helpers.eval, helpers.eq, helpers.neq
-local execute, source = helpers.execute, helpers.source
+local execute, source, expect = helpers.execute, helpers.source, helpers.expect
 
 describe('completion', function()
   before_each(function()
@@ -100,4 +100,45 @@ describe('completion', function()
       eq('', eval('getline(3)'))
     end)
   end)
+
+  describe("refresh:always", function()
+    before_each(function()
+      source([[
+        function! TestCompletion(findstart, base) abort
+          if a:findstart
+            let line = getline('.')
+            let start = col('.') - 1
+            while start > 0 && line[start - 1] =~ '\a'
+              let start -= 1
+            endwhile
+            return start
+          else
+            let ret = []
+            for m in split("January February March April May June July August September October November December")
+              if m =~ a:base  " match by regex
+                call add(ret, m)
+              endif
+            endfor
+            return {'words':ret, 'refresh':'always'}
+          endif
+        endfunction
+
+        set completeopt=menuone,noselect
+        set completefunc=TestCompletion
+      ]])
+    end )
+
+    it('completes on each input char', function ()
+      feed('i<C-x><C-u>gu<Down><C-y>')
+      expect('August')
+    end)
+    it("repeats correctly after backspace #2674", function ()
+      feed('o<C-x><C-u>Ja<BS><C-n><C-n><Esc>')
+      feed('.')
+      expect([[
+        
+        June
+        June]])
+    end)
+  end)
 end)