Major changes:
All grid data render switched from regular straight data source render to proxy.
If previously you push some data to grid it was stored and it is and read from it same way, also all changes were applied to data source. Now there is a proxy, previous source 'items' collection stores just indexes to physical rows, but by itself it is virtual rows. This change brings huge possibilities to the future development and support: such as less memory usage, flexible rows/columns trim etc. Now it's very easy to hide groups of items.
Plugin support improvement.
Now sorting moved as a plugin. Plugin collection can be exposed with external method. Plugin constructor is generic, you can easily create you own plugins to control grid core or extend existing plugins. Development and contribution got much easier.
Filtering plugin.
New filters component introduced. Now you can use system filters such as string/number filters. Or what is more important you can create your own filters.
With this release grid is more powerful and flexible.
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