Merge pull request ckeditor#10352 from ckeditor/ck/9672-modify-viewpo…

…rTopOffset-in-runtime

Feature: Introduced `editor.ui.viewportOffset` that allows modifying the viewport's offset in runtime. This value is used by the editor to e.g. position its sticky toolbar and contextual balloons. Additionally, the `config.toolbar.viewportTopOffset` property was moved to `config.ui.viewportOffset` and it now accepts an object. Closes ckeditor#9672.

BREAKING CHANGE: The `config.toolbar.viewportTopOffset` property was moved to `config.ui.viewportOffset` and it now accepts an object.

tests/ckeditor.js

@@ -189,8 +189,10 @@ describe( 'ClassicEditor build', () => {
 		it( 'allows configuring toolbar offset without overriding toolbar items', () => {
 			return ClassicEditor
 				.create( editorElement, {
-					toolbar: {
-						viewportTopOffset: 42
+					ui: {
+						viewportOffset: {
+							top: 42
+						}
 					}
 				} )
 				.then( newEditor => {