[Bug] Chinese epub vertical documents cannot be read normally

[Kao953]

Describe the bug

When using Readium to read Chinese books in vertical epub format or using the vertical text function, there is no problem with flipping chapters left and right, but when flipping to the next page up and down, it will be forced to jump to the next chapter and cannot flip normally.

a126af70-1411-48b3-ac70-e085b8ee8681.mp4

How to reproduce?

1. Open TestApp
2. Click chinese vertical text mode epub file
3. flip page

Readium version

v2.4.0

Android API version

33

Additional context

No response

[danielweck]

Hello, are you able/allowed to share a Chinese EPUB so we can run some tests? I am a Thorium developer, I would like to make sure that our implementation is correct for Chinese (we recently validated our Japanese support). Thank you!

[Kao953]

Sorry for the late response. The following link is valid until August 1st.
https://1drv.ms/u/s!Am0spwgeMVybjp1o9QvXEq076srMYw

[shovel-kun]

#656 should resolve this

[shovel-kun]

@mickael-menu Sorry for the mention, but I believe this issue can be closed.

[mickael-menu]

You're right, thank you

[qnga]

@shovel-kun Would you like to keep contributing to Readium? As you might have noticed, there are few people amongst us experienced with vertical writings, so you would be very useful, for instance to check the support in the new navigator. If you're interested, I can get you an invite to the Readium Slack, just send me an e-mail (you can find my address in my commit metadata).