Backend pdf #8673
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Backend pdf #8673
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PR Summary
The second pull request to address #8142 to address @tacaswell 's comment in #8644. Added a test case to compare generated figures using pdf backend with eps backend (the later does not have this bug). Added some small fix to testing facility in the process. Note that while implementing the test, I believe that along the way, someone tried to make automated comparison between pdf and eps images, but this engine does not really work on general images. I use this engine since the expected images are supposed to be blank, which is the only case where this engine really works (comparing blank to non-blank images)
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