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@kovidgoyal Great, glad to hear it!
I spent some time working through RTL and vertical writing usability issues that I discovered while working on support for these things.
The first few issues I tried attacking proved harder than I expected. For example, my sister pointed out a bug with titles and summaries in RTL books not being displayed in RTL, but it's hard to do anything about that because the books don't seem to set the RTL attribute on these elements as the ePub specification permits, so other than doing some sort of heuristics on the text, it's hard to know what the writing mode should be.
Luckily, I'm having some success with the selection handles with vertical text. I've discovered that the main reason it's not working is because of the bug with collapsed ranges on vertical text, so that should be solvable with enough time.
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