Features

• Added theme styles for the switch button (see ckeditor/ckeditor5-ui#402). (90ab35e)

  Also:

  • Defined styles of the .ck-button in .ck-list,
  • Simplified the .ck-list styles as .ck-list__item became just a container,
  • Aligned several components' styles to the new architecture of the lists and buttons (including flex),
  • Extended the theme manual test with various use-cases of switch buttons and buttons in the list (dropdown).

• Implemented a CSS–styled image upload loader (see ckeditor/ckeditor5-image#207). (594cf12)

• Implemented styles for the widget selection handle (see ckeditor/ckeditor5-widget#40). (0703b2b)

  Also fixed a regression after ckeditor/ckeditor5#936 which made the widget use wrong outline styles when the editable is blurred. Minor code refactoring in the widget styles.

Bug fixes

• Added missing box-sizing to the successful upload icon. Closes ckeditor/ckeditor5#1095. (72f0bbc)
• The DropdownPanelView should scroll when the content is long. Added a CSS custom property to control the height of the panel. Closes ckeditor/ckeditor5#952. (9804952)
• The switch button should be animated properly in Edge. Closes ckeditor/ckeditor5-ui#433. (1c0ec96)
• The table cell selection highlight is broken around merged cells. Closes ckeditor/ckeditor5-table#69. Closes ckeditor/ckeditor5-table#29. (084e9bb)
• The toggle switch button animation should be a tad faster. Closes #183. (1e9773c)

Other changes

• Used a solid box-shadow to indicate the :focus state of the .ck-button (also .ck-input). Obsoleted the background color change on .ck-button:focus to avoid situations when a focused button looks like an active one (see ckeditor/ckeditor5-ui#394). (ad5770c)

BREAKING CHANGES

• Various color variables --ck-color-button-...-focus have been renamed to --ck-color-button-...-hover.
• Several --ck-color-widget-* custom properties have been renamed to match the project's naming standards.