Features

• Added an additional event in markers conversion. Improved how MarkerOperation is transformed during undo. Closes #1604. (da5a390)
• Implemented Selection#is() and DocumentSelection#is() methods in both the model and the view. Closes #1663. (aac4948)
• Introduce the selection.getTopMostBlocks() method. (a9c41c8)
• Introduce the read-only View#isRenderingInProgress flag to check if the document is in the rendering phase. Closes ckeditor/ckeditor5#1530. (6577d04)
• Introduced Differ#getChangedMarkers. Closes #1658. (2e04af7)
• Introduced DocumentSelection#markers collection. Closes #1615. (b2c1d72)
• Introduced support for inline objects (enables support for inline widgets). Introduced Schema#isInline(). Closes [ckeditor/ckeditor5#1049](ckeditor/ckeditor5#1049). Closes [ckeditor/ckeditor5#1426](ckeditor/ckeditor5#1426). (6b36bf1)
• Introduced whitespace trimming to Model#hasContent(). DataController#get() method can now trim empty data (so it returns empty string instead of <p>&nbsp;</p>). Closes [ckeditor/ckeditor5#401](ckeditor/ckeditor5#401). (2b95dc3)
• Moved the root element DOM attributes management from the UI to the engine. Made it possible to use addPlaceholder() (now enablePlaceholder()) on the root editable. Introduced the View.detachDomRoot() method. Implemented additional placeholder helpers (showPlaceholder(), hidePlaceholder(), needsPlaceholder()) (see ckeditor/ckeditor5#479). Closes #899. (21dee6b)

Bug fixes

• MarkerOperation OT cases for undo. Closes #1650. (649cae0)

• MarkerOperation transformation in undo. Closes #1668. (c9932b8)

• Selection#getTopMostBlocks() should not leak from limit elements. Closes ckeditor/ckeditor5-table#163. (7bc0338)

• All content is properly removed after undoing paste in some scenarios. Closes [ckeditor/ckeditor5#1540](ckeditor/ckeditor5#1540). (08855d3)

• Converter priority passing in conversion.attributeToElement(). Closes #1617. (fe6d17d)

• Fake selection container should be correctly appended to the new editable element when creating a new fake selection in a different editable element than the one which was focused before. Closes [ckeditor/ckeditor5#1523](ckeditor/ckeditor5#1523). (3b53d5a)

• Filter out fake selection container before comparing DOM view root children in view renderer. Closes ckeditor/ckeditor5#1578. (6591f87)

• Moving to the same position is not handled by the Differ as a change. (7dfaae6)

• Prevented model.Writer from inserting empty text nodes. Closes #1320. (47070b5)

• Prevented View from firing the render event if there were no changes since the last rendering. Closes #1653. Closes #1660. (558638c)

• Renamed the event during selection attributes conversion. attribute:key becomes to attribute:key:$text. Closes #1597. (fd7734e)

• Stopped invoking view.render() by EditingController when the model document isn't changed. Closes #1653. (5d97fd6)

• Fixed memory leaks during editor initialization and destruction (see ckeditor/ckeditor5#1341). (bf86ffa)

• Undo and redo no longer crashes in scenarios featuring pasting content into earlier pasted content. Closes [ckeditor/ckeditor5#1385](ckeditor/ckeditor5#1385). (551ab50)

• Update model selection attributes and markers after each change that affects the selection. Closes #1673. (4f9ac0e)

• Add selection post-fixer improvements. Closes #1593. (7f40831)

Other changes

• Added support for handling data in multiple roots in DataController. Closes #1626. (0fb4295)
• Change Conversion class API. Closes #1640. (e7d09cd)
• Introduced editor.data#ready event. (46d9243)
• Removed wrap() from public API. Closes #1616. (1c7ef68)
• Swapped the order of parameters in Schema#findAllowedParent(). Now those parameters match to parameters in other methods of the Schema class. Closes #1636. (6515558)
• Upcast element to attribute defaults to low priority instead of normal. Closes ckeditor/ckeditor5#1399. (c33c49c)
• Expose conversion utilities. Closes #1556. (9306c22)

BREAKING CHANGES

• Upgraded minimal versions of Node to 8.0.0 and npm to 5.7.1. See: ckeditor/ckeditor5#1507. (612ea3c)
• DataController#get() method now returns an empty string when the editor content is empty (instead of returning e.g. <p>&nbsp;</p>).
• The wrap() conversion helper was removed from public API.
• The attachPlaceholder() has been renamed to enablePlaceholder().
• enablePlaceholder() accepts a configuration object instead of separate parameters.
• The detachPlaceholder() has been renamed to disablePlaceholder().
• The Conversion#register() method was removed from the public API. Use constructor parameters to pass dispatchers and Conversion#addAlias() to register an alternative conversion group for registered upcast or downcast dispatchers.
• The editor#dataReady event was removed. The editor.data#ready event has been introduced and should be used instead.
• Swapped the order of parameters in Schema#findAllowedParent().
• The second parameter (rootName) from DataController#init() method has been removed. To initialize data on a root different than default one an object with rootName - data pair should be passed.
• The second parameter (rootName) from DataController#set() method has been removed. To set data on a root different than default one an object with rootName - data pair should be passed.
• The editing.view.render() method was renamed to editing.view.forceRender(). It should be used with caution as it will re-render editing view and repaint the UI.
• The conversion.register() method now accepts single options object as a parameter.
• The downcastElementToElement() helper was removed from public API. Use conversion.for( 'downcast' ).elementToElement() instead.
• The downcastAttributeToElement() helper was removed from public API. Use conversion.for( 'downcast' ).attributeToElement() instead.
• The downcastAttributeToAttribute() helper was removed from public API. Use conversion.for( 'downcast' ).attributeToAttribute() instead.
• The downcastMarkerToElement() helper was removed from public API. Use conversion.for( 'downcast' ).markerToElement() instead.
• The downcastMarkerToHighlight() helper was removed from public API. Use conversion.for( 'downcast' ).markerToHighlight() instead.
• The upcastElementToElement() helper was removed from public API. Use conversion.for( 'upcast' ).elementToElement() instead.
• The upcastElementToAttribute() helper was removed from public API. Use conversion.for( 'upcast' ).elementToAttribute() instead.
• The upcastAttributeToAttribute() helper was removed from public API. Use conversion.for( 'upcast' ).attributeToAttribute() instead.
• The upcastElementToMarker() helper was removed from public API. Use conversion.for( 'upcast' ).elementToMarker() instead.
• The insertUIElement() and removeUIElement() downcast converters were removed from public API. Use conversion.for( 'downcast' ).markerToElement() instead.
• The highlightText(), highlightElement() and removeHighlight() downcast converters were removed from public API. Use conversion.for( 'downcast' ).markerToHighlight() instead.
• The insertElement() downcast converter was removed from public API. Use conversion.for( 'downcast' ).elementToElement() instead.
• The changeAttribute() downcast converter was removed from public API. Use conversion.for( 'downcast' ).attributeToAttribute() instead.