Martijn Cuppens ae71e71fe1 Allow nested structure for accordions (#25121) ...

This commit allows nested structures for accordions. Also a part of
the documentation about data-children is removed because this
functionality didn't work and it's not applicable anymore.

Tests with the collapse accordion are also a bit adjusted to the new
situation.

2017-12-31 14:53:33 +02:00

..

4.0

Allow nested structure for accordions (#25121)

2017-12-31 14:53:33 +02:00