Fix TOC issues with pandoc 2.18 in gitbook() #1329
Merged
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Fixes #1327 and close #1326 by dealing with empty spans introduced in gitbook.
basically for #1327 we had our usual regex issue following Pandoc 2.187 changes. There was the PART issue, but also the unnumbered chapter not being dealt with correctly.
We did not detect sooner because we did not have tests for this. So I took the time to add some more test for this - took me a while to master more XPATH but that will be useful for further tests.