Allows multiple Free Text fields to be added to form layout

[eightiesguy]

Overview

When building a conribution form, or altering the profile for a form, the Javascript rightly detects duplciate fields and prevents saving. Would like to make an exception for Free HTML fields (could be expanded to anything from the Formatting section if that section should expand)

Before

Work around is to save after each change. The form allows another Free HTML element to be added

After

Change alters the markDuplicates() method so that is_duplicate class is only applied when the ufFieldModel does not have the label 'Free HTML'. This will allow multiple Free HTML fields for formatting forms

Technical Details

If the PR involves technical details/changes/considerations which would not be manifest to a casual developer skimming the above sections, please describe the details here.

[civicrm-builder]

Can one of the admins verify this patch?

[civibot]

(Standard links)

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[eileenmcnaughton]

add to whitelist

[demeritcowboy]

jenkins ok to test

[eileenmcnaughton]

I see your point @demeritcowboy regarding 'doesn't break anything so let's not let the limitations be blocking' - I would prefer the things you pointed out be moved to code comments though - ideally I think this would apply to all formatting fields (as mentioned above) but I haven't dug in to see how hard it would be to make that change

[eileenmcnaughton]

@eightiesguy if you do have a chance to come back to this & up the code comments to save the person who says 'why doesn't think work on my French site' that would be good.

[demeritcowboy]

@eightiesguy Can you do another PR to add yourself to https://github.com/civicrm/civicrm-core/blob/master/contributor-key.yml for release notes credit?