Issue #3378216: Improve validation on text format configuration

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• 3a7df304 - Forgot to make test module D9 compatible.

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• 9d03f75e - 1 commit from branch project:1.0.x
• c28d8951 - Issue #3378216: Added stronger validation and tests.
• e4e05b6c - Forgot to make test module D9 compatible.

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added 1 commit

• 7b2401a0 - Added validation to ensure "Convert line feeds" filter is configured to run...

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added 1 commit

• 0cdd9537 - Fix order of filters after validation fail.

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added 1 commit

• 15d747cb - Added a couple of comments, removed unecessary else statement (thanks, h_kac!)

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merged