[O] [bug] orgstruct++-mode breaks backward-sentence

[Rasmus]

Hi,

Consider the following test file in text-mode where "|" is the cursor.

   1.  Foo bar
       baz|

Before turning on orgstruct++-mode backward-sentence will correctly go to
"|Foo".  When turning on orgstruct-mode, backward-sentence will also work
correctly.  So somehow orgstruct++ does something that ruins
backward-sentence.  Note that (sentence-end) does not seem to be affected
by orgstruct++-mode.

I'm not really sure how to debug this further.

Thanks,
Rasmus

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