Create possibility for nested subforms#17552

Merged

mbabker merged 3 commits intojoomla:stagingfrom

continga:issue-11551

Sep 22, 2018

Commits on Sep 16, 2018

This is a combination of 8 commits.
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Commit code styling errors and add an aria label for the outermost 'add' button.
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Commits on Sep 17, 2018

Fix double group-add button on repeatable subform type.
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