I'm fine with yielding this, but make no mistake about what a monster it is. I'd like to see the following tables filled in, agreed upon, and then fixed and asserted in a PR:

Expected inline `display`

Non-animated

Initially `block`

Initial state	`.show()`	`.hide()` or `.toggle()`	`.hide().show()` or `.toggle().toggle()`	`.show().hide()`
default `block`, no inline
cascade `block`, no inline
default `list-item`, inline `block`
cascade `list-item`, inline `block`
cascade `none`, inline `block`

Initially `inline`

Initial state	`.show()`	`.hide()` or `.toggle()`	`.hide().show()` or `.toggle().toggle()`	`.show().hide()`
default `inline`, no inline
cascade `inline`, no inline
default `block`, inline `inline`
cascade `block`, inline `inline`
cascade `none`, inline `inline`

Initially `list-item` (or other non-`block` non-`inline`)

Initial state	`.show()`	`.hide()` or `.toggle()`	`.hide().show()` or `.toggle().toggle()`	`.show().hide()`
default `list-item`, no inline
cascade `list-item`, no inline
default `inline`, inline `list-item`
cascade `inline`, inline `list-item`
cascade `none`, inline `list-item`

Initially `none`

Initial state	`.show()` or `.toggle()`	`.hide()`	`.hide().show()`	`.show().hide()` or `.toggle().toggle()`
~~default `none`, no inline~~
cascade `none`, no inline
default `block`, inline `none`
default `inline`, inline `none`
default `list-item`, inline `none`
cascade `block`, inline `none`
cascade `inline`, inline `none`
cascade `list-item`, inline `none`
cascade `none`, inline `none`

Animated

Given the following helpers:

function toggle( T, callback ) {
    return jQuery( this ).toggle( T, callback );
}

function partial( T, callback ) {
    return toggle.call( this, T )
        .delay( T/2, "simultaneous" )
        .queue( "simultaneous", function( next ) {
            if ( callback ) {
                callback.call( this, T/2 );
            }
            next();
        } )
        .dequeue( "simultaneous" );
}

Initially `block`

Initial state	`partial.call(el, T)`	`partial.call(el, T, toggle)`
default `block`, no inline
cascade `block`, no inline
default `list-item`, inline `block`
cascade `list-item`, inline `block`
cascade `none`, inline `block`

Initially `inline`

Initial state	`partial.call(el, T)`	`partial.call(el, T, toggle)`
default `inline`, no inline
cascade `inline`, no inline
default `block`, inline `inline`
cascade `block`, inline `inline`
cascade `none`, inline `inline`

Initially `list-item` (or other non-`block` non-`inline`)

Initial state	`partial.call(el, T)`	`partial.call(el, T, toggle)`
default `list-item`, no inline
cascade `list-item`, no inline
default `inline`, inline `list-item`
cascade `inline`, inline `list-item`
cascade `none`, inline `list-item`

Initially `none`

Initial state	`partial.call(el, T)`	`partial.call(el, T, toggle)`
~~default `none`, no inline~~
cascade `none`, no inline
default `block`, inline `none`
default `inline`, inline `none`
default `list-item`, inline `none`
cascade `block`, inline `none`
cascade `inline`, inline `none`
cascade `list-item`, inline `none`
cascade `none`, inline `none`

I think you'll find that "restoring the old behavior" doesn't really help. Still want it, @markelog?

Expected inline display

Non-animated

Initially block

Initially inline

Initially list-item (or other non-block non-inline)

Initially none

Animated

Initially block

Initially inline

Initially list-item (or other non-block non-inline)

Initially none

Expected inline `display`

Initially `block`

Initially `inline`

Initially `list-item` (or other non-`block` non-`inline`)

Initially `none`

Initially `block`

Initially `inline`

Initially `list-item` (or other non-`block` non-`inline`)

Initially `none`

Restore previous show/hide behavior #2654

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