test module for reproduce invisible_user_in_channel() bug

#include "unrealircd.h"

ModuleHeader MOD_HEADER = {
    "mymod",
    "1.0",
    "Just a test module",
    "westor",
    "unrealircd-6",
};

int avatar_chanmsg(Client *client, Channel *channel, MessageTag *mtags, const char *text, SendType sendtype);

MOD_INIT() {
    HookAdd(modinfo->handle, HOOKTYPE_PRE_CHANMSG, -100000000, mymod_chanmsg); // yeah lets use this priority just in case

    return MOD_SUCCESS;
}

MOD_LOAD() { return MOD_SUCCESS; }
MOD_UNLOAD() { return MOD_SUCCESS; }

int mymod_chanmsg(Client *client, Channel *channel, MessageTag *mtags, const char *text, SendType sendtype) {
    if (IsULine(client) || IsServer(client)) { return 0; }

    int invi = invisible_user_in_channel(client, channel);
    int has_d = has_channel_mode(channel, 'd');
    int has_D = has_channel_mode(channel, 'D');

    unreal_log(ULOG_INFO, "mymod", "MYMOD_TEST_CHANMSG", client, "$client is invisible on $chan [invisible: $invi] [+D: $D] [+d: $d]",
                log_data_channel("chan", channel),
                log_data_integer("invi", invi),
                log_data_integer("D", has_D),
                log_data_integer("d", has_d));

    return 0;
}