Creating categories on the fly with numbers

[SharkyKZ]

Pull Request for Issue #22216.

Summary of Changes

Adds prefix to categories created on the fly to allow creating categories starting with numbers.

Testing Instructions

1. Create a category and remember the ID (or use an existing category) e.g. "2"
2. Create a new article or edit one and try to create a new category with the name: "2nd workshop" (important: the ID of the category from 1. has to be the leading character) by typing in the name in the category select on the right side + confirm with [ENTER]
3. Save article

Expected result

A new category is created and assigned to the article

Actual result

The old category from 1 is assigned

Documentation Changes Required

New Categoryedit field property added.
Categories created on the fly contain #new# prefix.

[SharkyKZ]

On second thought this could be a B/C break for those programatically adding articles using the model. If using category title, it must now contain #new# prefix or else saving fails. Thoughts?

[SharkyKZ]

Should be OK now.

[ReLater]

I have tested this item ✅ successfully on 4cf418c

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[Quy]

I have tested this item ✅ successfully on 4cf418c

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/25024.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/25024.}

[HLeithner]

@bembelimen can you confirm that this fix your problem?

[bembelimen]

In general the PR solves the problem, thank you @SharkyKZ very good work.
I have one general thought here (which I'm not sure if related to this PR or needs a new one):

Let's assume we transfer a string as catid (so $createCategory is true) but $this->canCreateCategory() is false, what is the saved value for catid then? I assume "0"?

So tltr: PR is fine imho and can be merged. If this special (edge) case would also be handled, it would be nice, too.

[SharkyKZ]

The UI wouldn't allow to create category, but if you circumvent it, the ID would be 0. It's the same before this PR though.

[HLeithner]

thx

[wilsonge]

Sorry I just came across this. Isn't this a b/c break for people using com_categories because they need to change their models (like we had to in com_content). I think the component specific ones in banners and contact is fine) but not the com_categories one which is generic

[SharkyKZ]

@wilsonge No, the custom prefix property added to JFormFieldCategoryEdit is optional.

[wilsonge]

OK makes sense - missed that - thanks!