Spring.GetCEGID("nonexistent ceg") allocates a new ID

[sprunk]

• it never returns invalid for nonexistent CEG names, instead it allocates a new ID for them and then returns that ID consistently for given name. So there is no way to check if given CEG actually exists or not.
• not a realistic scenario but by allocating variable numbers of garbage CEGs you can get a desync if synced luarules ever asks about a nonexistent ceg and uses the returned ID.

[sprunk]

It should be a matter of splitting the "find generator" part away from CExplosionGeneratorHandler::LoadGenerator and using that in Spring.GetCEGID instead of the full function that allocates a new one if missing:

spring/rts/Sim/Projectiles/ExplosionGenerator.cpp

Lines 296 to 309 in 7363dbc

	{
	decltype(expGenIdentNameMap)::mapped_type key = {{0}};
	char* ptr = key.data();
	char* sep = nullptr;
	ptr += snprintf(ptr, sizeof(key) - (ptr - key.data()), "%s", pre);
	ptr += snprintf(ptr, sizeof(key) - (ptr - key.data()), "%s", tag);
	const auto hash = hashString(key.data());
	const auto iter = expGenHashIdentMap.find(hash);
	if (iter != expGenHashIdentMap.end())
	return explosionGenerators[iter->second];