Directive extraPlugins - allow array format

[Ivan Čentéš]

The extraPlugins directive should allow an array format. It would be more readable than a single string of comma separated values. And getting the values from this directive would be easier too, no need to split a string by commas.

[Jakub Ś]

We have decided on certain format and then created code that works with that format. These are the rules and you should apply to them.

You can always use below code for this particular requirement:

config.extraPlugins = [ ... ].join( ',' );

In this case we really don't see reason to complicate editor bahaviour, especially that you can do it on your own.