patch 9.1.0684: completion is inserted on Enter with "noselect"

Problem:  completion is inserted on Enter with "noselect"
          (Carman Fu)
Solution: check noselect before update compl_shown_match
          (glepnir)

fixes: #15526
closes: #15530

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/insexpand.c

@@ -1311,7 +1311,8 @@ ins_compl_build_pum(void)
 		{
 		    did_find_shown_match = TRUE;
 		    max_fuzzy_score = compl->cp_score;
-		    compl_shown_match = compl;
+		    if (!compl_no_select)
+			compl_shown_match = compl;
 		}
 
 		if (!shown_match_ok && compl == compl_shown_match && !compl_no_select)

src/testdir/test_ins_complete.vim

@@ -2654,6 +2654,13 @@ func Test_complete_fuzzy_match()
   call feedkeys("Su\<C-X>\<C-L>\<C-P>\<Esc>0", 'tx!')
   call assert_equal('no one can save me but you', getline('.'))
 
+  " issue #15526
+  set completeopt=fuzzy,menuone,menu,noselect
+  call setline(1, ['Text', 'ToText', ''])
+  call cursor(2, 1)
+  call feedkeys("STe\<C-X>\<C-N>x\<CR>\<Esc>0", 'tx!')
+  call assert_equal('Tex', getline('.'))
+
   " clean up
   set omnifunc=
   bw!

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    684,
 /**/
     683,
 /**/