closes #1041

There is currently an inconsistency in how we calculate the data-state attribute.

With Dialog Content and Overlay, Tooltip Content:

'data-state': $open ? 'open' : 'closed'

With the rest of the components (Link Preview Content, Menu Content, Popover Content, etc.):

'data-state': $isVisible ? 'open' : 'closed'

I believe that the data-state should be based on $open, because if we use forceVisible: true and always keep the content mounted, data-state will always be open.

The only place where this decision between $open and $isVisible matters, is when the user uses forceVisible: true, in which case if they unmount the component when $open is false and use a svelte transition, data-state will actually stay open because of how svelte internally freezes the component to transition it out. But if the user always leaves it as mounted and just changes the content's visibility, data-state should be closed, which is not currently the case with the codebase.

Now, if we agree that we should change the data-state based on $open, we need to make sure that we don't override styles set by floating-ui in certain components.

'data-state': $open ? 'open' : 'closed',
style: styleToString({
    display: $isVisible ? undefined : 'none',
}),

The above code would "rerender" every time the $open state changes, and if the user never unmounts the content, the styles will get reset to an empty string, thereby removing the styles set by floating-ui, which causes the component to jump. This was already fixed in the case of the tooltip content here #1010

The solution was to use the below code

'data-state': $open ? 'open' : 'closed',
style: $isVisible ? undefined : styleToString({ display: 'none' }),

... and to remove properties with undefined values returned from the tooltip content, because if we set style to undefined, svelte will also reset the styles set by floating-ui. So we needed to remove the style property altogether.

So since this will be a problem in all builders, we should remove properties with undefined values in the makeElement function.