Add ability to process data that goes to preview

[Piotrek Koszuliński]

Based on pull request: ​https://github.com/ckeditor/ckeditor-dev/pull/19

[Olek Nowodziński]

Added contentPreview event in ​t/9907@cksource with basic dt in t/9907@tests-v4.

To alter all occurrences of "Apollo" with "Gemini" in the preview of replacebycode sample's content, basically do the following:

CKEDITOR.replace( 'editor1', {
	on: {
		contentPreview: function( event ) {
			event.data.dataValue = event.data.dataValue.replace( /Apollo/g, 'Gemini' );
		}
	}
} );

[Olek Nowodziński]

Feature added to major in commit ​git:2ae48b9

Tests pushed to major with 5866ffd@tests-v4.

[Piotrek Koszuliński]

Isn't it possible to close preview window on test tear down or block it somehow? It stays opened when running tests suite and I'm anticipating unwelcome surprises :D

[Olek Nowodziński]

Replying to Reinmar:

Isn't it possible to close preview window on test tear down or block it somehow? It stays opened when running tests suite and I'm anticipating unwelcome surprises :D

Reopening the ticket to fix this issue.

[Olek Nowodziński]

Created ​t/9907b@cksource + t/9907b@tests-v4.

Added possibility to prevent preview window from being open via contentPreview event. Used this feature to fix tests: no annoying popups anymore.

[Olek Nowodziński]

Fixed popup issue in ​git:3e347c8687 (major) (tests: 4eb7762).