Add support for page-break-before: avoid; and page-break-after: avoid; for <tr> elements

[carli2]

This code is sponsored by Launix (https://launix.de) and released under GPL 2.0

In order to not get into fork hell, we appreciate a fast release of the feature in the next minor version.

[finwe]

Thanks for the PR. in order to be incorporated, please add a reasonable test coverage and include a changelog entry.

[carli2]

Thanks to the unit tests I found a copy&paste error, so the change should be fine now.

[finwe]

Can you also please move the test to a separate class under Issues/? Thanks.

[finwe]

You should be able to check CS locally easily by just running composer cs.

[carli2]

You should be able to check CS locally easily by just running composer cs.

which issue number shall I use?

[finwe]

Well, this one, 2004

[finwe]

Great, thanks! Can you also prepare a PR to update the supported CSS docs at https://github.com/mpdf/mpdf.github.io/blob/master/css-stylesheets/supported-css.md?

[carli2]

Great, thanks! Can you also prepare a PR to update the supported CSS docs at https://github.com/mpdf/mpdf.github.io/blob/master/css-stylesheets/supported-css.md?

done