[css-ruby] Interaction of autohiding and some properties

Hi,

I notice that it is not defined what should happen if "ruby-merge:
collapse" and/or "ruby-align: *" are applied to a container which contains
an autohidden annotation. For example:

<ruby style="ruby-merge:collapse">
    <rb>振</rb><rb>り</rb><rb>仮</rb><rb>名</rb>
    <rt>ふ</rt><rt>り</rt><rt>が</rt><rt>な</rt>
</ruby>

I propose that it should be rendered as two separate segments, like:

<ruby>
    <rb>振</rb><rt>ふ</rt>
<ruby>
り
<ruby style="ruby-merge:collapse">
    <rb>仮</rb><rb>名</rb>
    <rt>が</rt><rt>な</rt>
</ruby>

What do you think?

Best regards,
Xidorn Quan