Monster walk through bug

[gugahoa]

Before creating an issue, please ensure:

• This is a bug in the software that resides in this repository, and not a
  support matter (use https://otland.net/forums/support.16/ for support)
• This issue is reproducible without changes to the code in this repository

Steps to reproduce (include any configuration/script required to reproduce)

1. Log into a player, or summon a monster
2. Create (with /m) 10 rats. 2 Will start random step.
3. Create a monster that can push (Cyclops/Dragon)

Expected behaviour

I'm not sure as I don't play official Tibia. Something along the line of pushing the weaker monster out of the way or side stepping until there's room is what I think is acceptable in this case.

Actual behaviour

Stronger monster will try to walk through weaker monster, deleting him (weaker monster) in the process

[vankk]

I can confirm that too.

[ranisalt]

In Tibia stronger monsters crush weaker monsters if there is no room to reach the target. Not all monsters do that, though. It's actually used as strategy to kill bosses that summon a lot (such as Ghazbaran's deathslicers), limiting space around the blocker so that the Ghazbaran crushes the deathslicers to get through.

It could be a switch, though, since I would prefer monsters to be pushed instead. We already have the logic for pushing crates around so it should be easy to implement.

[gugahoa]

In Monster::pushCreatures, any monster that can push, will have that behavior. Can someone confirm if any monster has that behavior or only really strong monsters?

[techrlz18]

Confirmed that too.

[peonso]

Fix for that here #922 (comment)

Monsters with canpushitems="1" should be able to push monsters with pushable="1". The pushed monster is pushed to side if there is a free sqm (in the speed of the pushing monster), if there isn't, it is killed.

https://youtu.be/a9FbrBmOseI

[ranisalt]

@wgrriffel I meant players use this stuff to kill bosses, not that it's monster behavior.

Also, monsters are all either pushable or can push. That's like... physics.

[ranisalt]

As I said, we can just use logic from moving crates. It already does the job of moving if possible, else crushing.