Add a "prev map" key binding

[ceski-1]

This would be very useful for testing. I think the key bindings menu is out of room though.

[fabiangreffrath]

How about this?

int G_GotoPrevLevel(void)
{
    const int cur_epsd = gameepisode;
    const int cur_map = gamemap;
    const int start_epsd = (gamemode == commercial) ? 1 : 9;
    int ret = false;

    for (gameepisode = start_epsd; gameepisode > 0; gameepisode--)
    {
        for (gamemap = 99; gamemap >= 0; gamemap--)
        {
            int next_epsd, next_map;
            G_GotoNextLevel(&next_epsd, &next_map);

            if (next_epsd == cur_epsd && next_map == cur_map)
            {
                G_DeferedInitNew(gameskill, gameepisode, gamemap);
                ret = true;
                break;
            }
        }
    }

    gameepisode = cur_epsd;
    gamemap = cur_map;

    return ret;
}

[rfomin]

for (gamemap = 99; gamemap >= 0; gamemap--)

Why are we looking from the end?

BTW, It is possible that we will not find the current map due to secret exits. Try to test "Fork in the Road" WAD

[fabiangreffrath]

Why are we looking from the end?

I'd like to find the highest possible map that would lead to the current map. For reasons I don't remember. It appeared plausible to me. 😁

BTW, It is possible that we will not find the current map due to secret exits. Try to test "Fork in the Road" WAD

Yes, it's possible, but then nothing will happen. We will have to provide feedback to the player, just as we do for e.g. IDCLEV99.