patch 9.1.0945: ComplMatchIns highlight doesn't end after inserted text

Problem:  ComplMatchIns highlight doesn't end after inserted text.
Solution: Handle ComplMatchIns highlight more like search highlight.
          Fix off-by-one error. Handle deleting text properly.
          (zeertzjq)

closes: #16244

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/highlight.c b/src/highlight.c
index a4b2d48..628ceb2 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -262,7 +262,7 @@
     "default link PmenuMatchSel PmenuSel",
     "default link PmenuExtra Pmenu",
     "default link PmenuExtraSel PmenuSel",
-    "default link ComplMatchIns Normal",
+    CENT("ComplMatchIns cterm=NONE", "ComplMatchIns gui=NONE"),
     CENT("Normal cterm=NONE", "Normal gui=NONE"),
     NULL
 };