Fix issue #2739 allow for multiple bounding boxes in an element. #2951
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Summary
This PR fixes/implements the following bugs/features
Explain the motivation for making this change. What existing problem does the pull request solve?
elements with multiple bounding boxes are not correctly drawn. e.g. spans that flow to multiple lines. This causes backgrounds and borders to draw over previous elements.
Test plan
tests\reftests\text\background-on-multiline-span.html
Fixes #2739
closes #2739