patch 9.1.0996: ComplMatchIns may highlight wrong text

Problem:  ComplMatchIns may highlight wrong text
Solution: don't highlight in case of fuzzy match,
          skip-highlight when not inserting anything
          (glepnir)

closes: #16404

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_07.dump b/src/testdir/dumps/Test_pum_matchins_combine_07.dump
new file mode 100644
index 0000000..60d5a67
--- /dev/null
+++ b/src/testdir/dumps/Test_pum_matchins_combine_07.dump
@@ -0,0 +1,20 @@
+|f+8&#40ff4011@1|o+8#ffff4012#ff404010@1> +8#0000000#40ff4011@70
+| +0#0000001#e0e0e08|f|o@1| @11| +0#4040ff13#4040ff13@58
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |O|m|n|i| |c|o|m|p|l|e|t|i|o|n| |(|^|O|^|N|^|P|)| |m+0#00e0003&|a|t|c|h| |1| |o|f| |3| +0#0000000&@34
diff --git a/src/testdir/dumps/Test_pum_matchins_combine_08.dump b/src/testdir/dumps/Test_pum_matchins_combine_08.dump
new file mode 100644
index 0000000..c0b4149
--- /dev/null
+++ b/src/testdir/dumps/Test_pum_matchins_combine_08.dump
@@ -0,0 +1,20 @@
+|f+8&#40ff4011@1|o@1> @70
+| +0#0000001#e0e0e08|f|o@1| @11| +0#4040ff13#4040ff13@58
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|-+2#0000000&@1| |O|m|n|i| |c|o|m|p|l|e|t|i|o|n| |(|^|O|^|N|^|P|)| |m+0#00e0003&|a|t|c|h| |1| |o|f| |3| +0#0000000&@34
diff --git a/src/testdir/test_popup.vim b/src/testdir/test_popup.vim
index 729fbec..3f4836f 100644
--- a/src/testdir/test_popup.vim
+++ b/src/testdir/test_popup.vim
@@ -1816,6 +1816,20 @@
   call VerifyScreenDump(buf, 'Test_pum_matchins_combine_06', {})
   call term_sendkeys(buf, "\<Esc>")
 
+  " Does not highlight the compl leader
+  call TermWait(buf)
+  call term_sendkeys(buf, ":set cot+=menuone,noselect\<CR>")
+  call TermWait(buf)
+  call term_sendkeys(buf, "S\<C-X>\<C-O>f\<C-N>")
+  call VerifyScreenDump(buf, 'Test_pum_matchins_combine_07', {})
+  call term_sendkeys(buf, "\<C-E>\<Esc>")
+
+  call term_sendkeys(buf, ":set cot+=fuzzy\<CR>")
+  call TermWait(buf)
+  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 StopVimInTerminal(buf)
 endfunc