sealing containers that aren't 100% full

[dynst]

Is your feature request related to a problem? Please describe.

Cataclysm-DDA/src/item.cpp

Lines 10212 to 10219 in c224235

	bool item::seal()
	{
	if( is_container_full() ) {
	return contents.seal_all_pockets();
	} else {
	return false;
	}
	}

This if statement added in #46359 means even if there's 480 ml of food in a 500 ml bag_plastic_small, it can't spawn sealed.

Solution you would like.

Allow containers to be sealed, but without reintroducing sealed nearly-empty bottles of bleach (when the number of charges is randomized). #45650 (comment)

Maybe sealing could be enabled for containers whose contents were determined nonrandomly, or if adding 1 more charge/item of the same type would overflow.

Describe alternatives you have considered.

No response

Additional context

#80955 (comment)

#81352