Use field editorconfig when sanitising content

[blueo]

see #10975 for the original issue
This changes to using the field configured HTMLEditorConfig instance when sanitising content for saving. It will fall back to the active config if none is defined on the field.

Issue

• HTMLEditorField doesn't use field assigned configuration for sanitisation #10975

[blueo]

Wasn't exactly sure which branch to target - currently 5 but maybe should b 4?

[GuySartorelli]

If this is a bug that affects CMS 4, please target the 4.13 branch.
For future reference: https://docs.silverstripe.org/en/contributing/code/#picking-the-right-version

[blueo]

thanks I'll keep that for reference as I often wonder which one :)

[GuySartorelli]

Works great locally, thanks for this.