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oleibman
dfab88262a
Fix #4823. When writing a spreadsheet to Html, a data Uri can be used if `embedImages` is true. Reading such an Html spreadsheet and attempting to write it to Xlsx results in an Exception. It should be noted that Excel itself cannot open the Html properly; none of the images are present. The PhpSpreadsheet problem arises not with the inclusion of the image, but rather with attempting to include the appropriate entry in `[ContentTypes].xml`. This PR corrects that problem. For the record, Xls Writer does not have a problem with this situation. Just to demonstrate that, a parallel test for Xls Writer is added in addition to the new Xlsx Writer test.
