* Welcome to support for indentation with spaces in to_xml plugin
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Changelog fragment
* Unit tests for:
* Indent with spaces and explicit indent_width (4)
* Invalid indent
I also slightly modified VALID_DATA to produce output with indentation,
so existing test_valid_data and OUTPUT has been updated accordingly.
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Fix changelog section name to minor_changes
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>