Because the names of the `get_header()`, `get_footer()`, `get_sidebar()`, and `get_template_part()` functions indicate that a value is returned, some plugins and themes already have `echo get_template_part()` in their codebase. Adding a return value to these functions using the approach in [44678] will cause the two unintended side effects of unexpected content being sent to the browser, and accidental path disclosure.
Reverts [44678].
Props davidbinda.
See #40969.
git-svn-id: https://develop.svn.wordpress.org/trunk@44725 602fd350-edb4-49c9-b593-d223f7449a82
666d713c1b