26c4be2ebe
There's no reason to disable fast-delete when an intermediary many-to-many model has connected m2m_changed receivers because the signal is only sent when related manager's clear() and remove() methods are directly called. This must have been overlooked in 1cd6e04cd4f768bcd4385b75de433d497d938f82 given no regression tests fail when m2m_changed is not taken into consideration to determine if fast-delete can be enabled.
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