fix(completion): prevent K_LUA from closing pum

src/nvim/edit.c

@@ -3620,7 +3620,7 @@ static bool ins_compl_prep(int c)
   // Ignore end of Select mode mapping and mouse scroll buttons.
   if (c == K_SELECT || c == K_MOUSEDOWN || c == K_MOUSEUP
       || c == K_MOUSELEFT || c == K_MOUSERIGHT || c == K_EVENT
-      || c == K_COMMAND) {
+      || c == K_COMMAND || c == K_LUA) {
     return retval;
   }