patch 9.1.1005: completion text is highlighted even with no pattern found

Problem:  completion text is highlighted even with no pattern found
Solution: use ins_compl_leader_len() instead of checking
          compl_leader.length (glepnir)

closes: #16422

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/dumps/Test_pum_matchins_combine_09.dump b/src/testdir/dumps/Test_pum_matchins_combine_09.dump
new file mode 100644
index 0000000..d7904b2
--- /dev/null
+++ b/src/testdir/dumps/Test_pum_matchins_combine_09.dump
@@ -0,0 +1,20 @@
+|f+8&#40ff4011> @73
+|~+0#4040ff13#4040ff13| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |K|e|y|w|o|r|d| |c|o|m|p|l|e|t|i|o|n| |(|^|N|^|P|)| |P+0#ffffff16#e000002|a|t@1|e|r|n| |n|o|t| |f|o|u|n|d| +0#0000000#4040ff13@28
diff --git a/src/testdir/test_popup.vim b/src/testdir/test_popup.vim
index 3f4836f..0303c42 100644
--- a/src/testdir/test_popup.vim
+++ b/src/testdir/test_popup.vim
@@ -1829,6 +1829,13 @@
   call term_sendkeys(buf, "S\<C-X>\<C-O>f\<C-N>")
   call VerifyScreenDump(buf, 'Test_pum_matchins_combine_08', {})
   call term_sendkeys(buf, "\<C-E>\<Esc>")
+  call TermWait(buf)
+
+  call term_sendkeys(buf, ":set cot-=fuzzy\<CR>")
+  call TermWait(buf)
+  call term_sendkeys(buf, "Sf\<C-N>")
+  call VerifyScreenDump(buf, 'Test_pum_matchins_combine_09', {})
+  call term_sendkeys(buf, "\<C-E>\<Esc>")
 
   call StopVimInTerminal(buf)
 endfunc