Features

• Introduce ElementDefinition#priority property which allows specifying the priority of created element during the downcast conversion. Closes #1408. (e20e133)
• Introduced ModelDocument#change:data event. Closes #1418. (872f4ff)
• Introduced a selection post-fixer. Its role is to ensure that after all changes are applied the selection is placed in a correct position. Closes #1156. Closes #1176. Closes #1182. Closes ckeditor/ckeditor5-table#11. Closes ckeditor/ckeditor5-table#12. Closes ckeditor/ckeditor5-table#15. Closes ckeditor/ckeditor5#562. Closes ckeditor/ckeditor5#611. (6cf91a1)

Bug fixes

• Block filler will be inserted into the container if its last child is a <br> element. Closes #1422. (ba3d641)
• Fixed view <-> DOM conversion of whitespaces around <br> elements. Closes ckeditor/ckeditor5#1024. (3e74554)
• Renderer should avoid doing unnecessary DOM structure changes. Ensuring that the DOM gets updated less frequently fixes many issues with text composition. Closes #1417. Closes #1409. Closes #1349. Closes #1334. Closes #898. Closes ckeditor/ckeditor5-typing#129. Closes ckeditor/ckeditor5-typing#89. Closes #1427. (457afde)

Other changes

• Renderer now uses partial text replacing when updating text nodes instead of replacing entire nodes. Closes #403. (797cd97)