Patch from #6, with changes to EntityProcessorBase removed for now, to make...

Patch from #6, with changes to EntityProcessorBase removed for now, to make rebasing on 8.x-3.x easier.

Closes #3063055

added 3 commits

• 9b8be1af - Moved new methods to a new interface, for backwards compatibility.
• a7ae9d5e - Single phpcs fix.
• 32331119 - Added functionality for validating an item in EntityProcessorBase.

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marked this merge request as ready

added 1 commit

• e2f7bb89 - Fixed undefined variable label in EntityProcessorBase.

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added 4 commits

• e2f7bb89...f27462fd - 2 commits from branch project:8.x-3.x
• 58eaf0ce - Merge branch '8.x-3.x' into 3063055-item-validation
• 8d54238a - Do not export properties 'valid' and 'invalidMessage' in BaseItem::toArray().

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added 1 commit

• 37b66ef6 - Changes to code comments.

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added 9 commits

• 5106ed23 - 1 commit from branch project:8.x-3.x
• 030a6ca7 - Patch from #6, with changes to EntityProcessorBase removed for now, to make...
• c0981bf4 - Worked on a Kernel test.
• d2e7f494 - Moved new methods to a new interface, for backwards compatibility.
• 4449a275 - Single phpcs fix.
• b56f6f7f - Added functionality for validating an item in EntityProcessorBase.
• 151b6317 - Fixed undefined variable label in EntityProcessorBase.
• 9d02565e - Do not export properties 'valid' and 'invalidMessage' in BaseItem::toArray().
• ff88014d - Changes to code comments.

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merged