[issue8845] Expose sqlite3 connection inTransaction as read-only in_transaction attribute

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

@exarkun: yes, but since the module is already tracking that information, it seems silly to duplicate it in my code, especially since that duplication could include data-losing bugs.

@l0nwlf: its behaviour is in accord with the module documentation, which talks about the fact that issuing a create statement (for example) commits the current transaction.  So in_transaction is an accurate representation of what sqlite3 is actually doing.

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