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Fill Patterns/Colors When Xml Attributes are Missing #4250

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Fix #4248. PhpSpreadsheet has used what appear to be default attributes and tags when they are missing from Fill patterns and colors. However, Excel handles their absence a little differently from what the "default" would require. PhpSpreadsheet is changed to omit the attributes and tags in question when missing. This change is mostly targeted towards Xlsx read and write, but minor changes for Xls and Html write are also included.

This seems like it could be a breaking change, but I don't think it is. One test (DefaultFillTest introduced by PR #2050) must change, but the change is internal - loading and then saving the spreadsheet used in that change will appear the same after this change as it did before. Other differences are very likely to be bug fixes rather than breaks.

This is:

  • a bugfix
  • a new feature
  • refactoring
  • additional unit tests

Checklist:

  • Changes are covered by unit tests
    • Changes are covered by existing unit tests
    • New unit tests have been added
  • Code style is respected
  • Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
  • CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
  • Documentation is updated as necessary

Why this change is needed?

Provide an explanation of why this change is needed, with links to any Issues (if appropriate).
If this is a bugfix or a new feature, and there are no existing Issues, then please also create an issue that will make it easier to track progress with this PR.

Fix PHPOffice#4248. PhpSpreadsheet has used what appear to be default attributes and tags when they are missing from Fill patterns and colors. However, Excel handles their absence a little differently from what the "default" would require. PhpSpreadsheet is changed to omit the attributes and tags in question when missing. This change is mostly targeted towards Xlsx read and write, but minor changes for Xls and Html write are also included.

This seems like it could be a breaking change, but I don't think it is. One test (DefaultFillTest introduced by PR PHPOffice#2050) must change, but the change is internal - loading and then saving the spreadsheet used in that change will appear the same after this change as it did before. Other differences are very likely to be bug fixes rather than breaks.
@oleibman
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No concern with Scrutinizer "complexity" message.

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Image and gray disappear after IOFactory::createWriter and save
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