There is a post about it Collapsiblesections.js is gone- long live pat-collapsible?
but grepping through the code gives me nothing.
Do we have a mapping of old -> new patterns?
Small easy tasks seems to have become time-consuming...
What specifically are you trying to do?
I'm trying to port an addon from plone 4 to plone 5.
In plone 5 much of this is reimplemented as patterns, or deprecated.
Do we have a list of the patterns enabled in plone 5 somewhere?
Plone 5 comes with a modified version of bootstrap 3, right? What is possible here?
I can see in the source that bootstrap collapse is packaged: