1st Button in inline_usecombination not working correctly

[DavidBruchmann]

Bug Report

Prerequisites

• [x] Did you reproduce the problem on TYPO3 core master?
• [x] Did you reproduce the problem on TYPO3 v10.4 LTS?
• [ ] Did you reproduce the problem on TYPO3 v9.5 LTS?

Description

The example tx_styleguide_inline_usecombination has two buttons:

1. Button 1 shall create a new record, of the child table.
2. Button 2 shall create a relation to an existing record of the child table.

Both buttons work similar and depend on the situation if a child record to create a relation is available.
If there exist child records without relation a relation is created, else a new record .
So the behavior of the buttons never depends at all on their intended purpose but on the potential child records.

Steps to Reproduce

1. Install TYPO3 with the extension styleguide.
2. try to use the buttons like intended with and without child records that haven't a relation.

Expected behavior: [What you expected to happen]

In any case I expect that the 1st button is creating a new child record and no relation.

Actual behavior: [What actually happened]

The 1st button creates a new relation only if no more child records can be found to include in a relation.

Versions

typo3/cms-core: 11.5.x-dev f9e8cdb
typo3/cms-styleguide: 11.x-dev 57b637f

[DavidBruchmann]

If there are no more records to create a relation, the second button is also creating a new relation. So that could be a feature but actually that's perhaps neither like intended.