Following commit 828c7c3da9:
the kanban record animation when a theme is hovered was blurry with
chrome and laggy with firefox (with linux at least). This commit
removes the scale part of the animation which was the cause of this.
- Handle vertical screenshots
- If a theme is installed, show it first, hide buttons and use a
specific design
- If no screenshot has been defined, show the cover (or the icon if no
covers has been defined neither)
- Show theme's name and category
- Allow to filter by category
- Design grouped layout