Some of the jquery plugins shipped with 2.5 has been optimized for large sections (+100 fields) and also features and brand new jquery plugin: the affix plugin.
The optimization also brings new public events on the collapsible plugin:
updatesize.collapsible
which will invalidate the cached values for the height of the DOM elements.setsize.collapsible
which will set the min and max height CSS properties based on the cached values.
If you develop a field that uses the collapsible
plugin, feel free to trigger those events.
The new plugin, affix
will make a element "sticky" on the page, in order to "follow" the scroll. This plugin is used in the section editor in order to make the Expand/Collapse button always visible.