[5.1] Load Schema.org only in proper forms

[n3t]

Load and display scheme.org form only in contexts that component propagate as available.

Summary of Changes

Modified Schemaorg system plugin to load Schema form only in contexts, that are promoted by component as available.

Testing Instructions

Not testable on core, as com_content and com_contact both has only one edit view, one edit form. Need 3rd party component with support of SchemaorgServiceInterface.
Dev version of PhocaCart could be used (not released at the moment). If necessary I could prepare dummy component just for testing this.

Actual result BEFORE applying this Pull Request

If the component provides multiple forms, schema.org form is added to all of its forms, not only to forms declared in
getSchemaorgContexts function.

Expected result AFTER applying this Pull Request

Schema org fields are loaded only on proper forms.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[PhocaCz]

I have tested this item ✅ successfully on 7d5f44f

Hi,

testing with latest Phoca Cart 5 Beta version: https://github.com/PhocaCz/PhocaCart/releases/download/5.0.0Beta/com_phocacart_v5.0.0Beta26.zip

Before:

(additional tab is displayed)

After:

(no additional tab is displayed)

Tested sucessfully ✓

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[coufalpetr]

I have tested this item ✅ successfully on 7d5f44f

Hi, I have installed the latest Phoca Cart Beta version, after installing this patch I don't see any extra unnecessary tab. So the result is successful.

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[richard67]

RTC

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[cybersalt]

I have tested this item ✅ successfully on 660b142

Also used Phocacart in testing - it works.

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[viocassel]

I have tested this item ✅ successfully on 660b142

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[n3t]

Just curious, this PR is marked RTC since 3 months ago, but still not commited, so missing in 5.1.1 release, is there any issue with it? Should I add something?