On with multiple clauses via 'or' does not allow 'from' clause.

Minimal repo case showing that separate `on` handlers works, but that two `on` handlers each with a `from` clause causes a "Expected commandList" error.

```html

behavior SeparateWorks
on first from #events
toggle [@hidden] on me
end
on second from #events
toggle [@hidden] on me
end
end
behavior FirstDoesntWork
-- No syntax error, but first function doesn't toggle
on first or second from #events
toggle [@hidden] on me
end
end
behavior SecondDoesntWork
-- No syntax error, but second button doesn't toggle
on first from #events or second
toggle [@hidden] on me
end
end


-- in a separate script so syntax error doesn't break other cases....
behavior Broken
on first from #events or second from #events
toggle [@hidden] on me
end
end

First
Second

• Separate Works - Initial


• Separate Works - Toggled


• Doesn't Work First - Initial


• Doesn't Work First - Toggled


• Doesn't Work Second - Initial


• Doesn't Work Second - Toggled


• Broken - Initial


• Broken - Toggled

```

最小限の HTML 再現例から始め、`from` と `or` を含む hyperscript の `on` ハンドラーのパースを追跡してください。動作する個別のハンドラーと、失敗する結合形式を比較してください。両方のハンドラーが `Expected commandList` エラーなしでパースされ、それぞれのイベントに応答すれば完了です。

索引モデルが issue の本文から書いたものです。