Bug summary

There is a typo in the method name contains_branch_seperately from lib/matplotlib/transforms.py:

This should be spelled contains_branch_separately (separate not seperate).

Since this is a public API method, I propose:

1. Rename the method to contains_branch_separately (correct spelling)
2. Create an alias from the old contains_branch_seperately spelling to the new method for backwards compatibility
3. Add a deprecation warning when the old name is used
4. Update any internal uses and documentation to use the correct spelling

Happy to prepare a PR for this if that makes sense!

Code for reproduction

# Copied from lib/matplotlib/transforms.py

    def contains_branch_seperately(self, other_transform):
        """
        Return whether the given branch is a sub-tree of this transform on
        each separate dimension.

        A common use for this method is to identify if a transform is a blended
        transform containing an Axes' data transform. e.g.::

            x_isdata, y_isdata = trans.contains_branch_seperately(ax.transData)

        """
        if self.output_dims != 2:
            raise ValueError('contains_branch_seperately only supports '
                             'transforms with 2 output dimensions')
        # for a non-blended transform each separate dimension is the same, so
        # just return the appropriate shape.
        return (self.contains_branch(other_transform), ) * 2

Actual outcome

Code runs as expected, but method name contains a typo.

Expected outcome

Method name should be correctly spelled as contains_branch_separately

Additional information

No response

Operating system

No response

Matplotlib Version

Current main branch, as of a3fcf0b (25 August 2025)

Matplotlib Backend

No response

Python version

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Jupyter version

No response

Installation

None