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`TransformNode.is_bbox`#

... is removed. Instead check the object using isinstance(..., BboxBase).

`rcsetup.interactive_bk`, `rcsetup.non_interactive_bk` and `rcsetup.all_backends`#

... are removed and replaced by matplotlib.backends.backend_registry.list_builtin with the following arguments

matplotlib.backends.BackendFilter.INTERACTIVE
matplotlib.backends.BackendFilter.NON_INTERACTIVE
None

`BboxTransformToMaxOnly`#

... is removed. It can be replaced by BboxTransformTo(LockableBbox(bbox, x0=0, y0=0)).

interval parameter of `TimerBase.start`#

The timer interval parameter can no longer be set while starting it. The interval can be specified instead in the timer constructor, or by setting the timer.interval attribute.