vim-patch:9.1.0631: wrong completion list displayed with non-existing dir + fuzzy completion

Problem:  wrong completion list displayed with non-existing dir + fuzzy
          completion (kawarimidoll)
Solution: clear list of matches, if leader did not use fuzzy match
          (glepnir)

fixes: vim/vim#15357
closes: vim/vim#15365

6b6280c4a2

Co-authored-by: glepnir <glephunter@gmail.com>

src/nvim/insexpand.c

@@ -3339,6 +3339,7 @@ static void get_next_filename_completion(void)
 
       // Move leader to the file part
       leader = last_sep + 1;
+      leader_len -= path_len;
     }
   }
 
@@ -3392,13 +3393,18 @@ static void get_next_filename_completion(void)
       FreeWild(num_matches, matches);
       matches = sorted_matches;
       num_matches = fuzzy_indices.ga_len;
+    } else if (leader_len > 0) {
+      FreeWild(num_matches, matches);
+      num_matches = 0;
     }
 
     xfree(compl_fuzzy_scores);
     ga_clear(&fuzzy_indices);
   }
 
-  ins_compl_add_matches(num_matches, matches, p_fic || p_wic);
+  if (num_matches > 0) {
+    ins_compl_add_matches(num_matches, matches, p_fic || p_wic);
+  }
 }
 
 /// Get the next set of command-line completions matching "compl_pattern".

test/functional/ui/popupmenu_spec.lua

@@ -6955,6 +6955,13 @@ describe('builtin popupmenu', function()
           {2:-- }{5:match 2 of 3}                 |
         ]])
 
+        feed('<Esc>S/non_exit_folder<C-X><C-F>')
+        screen:expect([[
+          /non_exit_folder^                |
+          {1:~                               }|*18
+          {2:-- }{6:Pattern not found}            |
+        ]])
+
         feed('<C-E><Esc>')
       end)
 

test/old/testdir/test_popup.vim

@@ -1513,6 +1513,11 @@ func Test_pum_highlights_match()
   call TermWait(buf, 50)
   call VerifyScreenDump(buf, 'Test_pum_highlights_11', {})
 
+  " issue #15357
+  call term_sendkeys(buf, "\<ESC>S/non_exit_folder\<C-X>\<C-F>")
+  call TermWait(buf, 50)
+  call VerifyScreenDump(buf, 'Test_pum_highlights_15', {})
+
   call term_sendkeys(buf, "\<C-E>\<Esc>")
   call TermWait(buf)