Deprecated

Files in a plugin's assets directory are now always assumed to be public, independent of their file extension. If your plugin needs to store other files in the assets directory, please use the new assets extension to explicitly define the public assets.
Passing a single space as value to Xml::attr() (with the intention to generate an attribute with an empty value) has been deprecated in favor of passing an empty string.
Kirby\Cms\Model: Use Kirby\Cms\ModelWithContent instead
Kirby\Email\Email::clone() and Kirby\Email\Body::clone()
Page::isReadable(): Use Page::isAccessible() instead
The name query should not be used for custom API endpoints anymore, it will be used for the Kirby QL (KQL) plugin/core implementation
Internal $model->contentFile(), $model->contentFiles(), $model->contentFileDirectory(), $model->contentFileExtension() and $model->contentFileName() methods have been deprecated and will be removed in v5.

Custom icons using a 16x16 viewbox have been deprecated. In an upcoming version, Kirby will only support custom icons with a 24x24 viewbox by default. If you want to continue using icons with a different viewport, please wrap them in an <svg> element with the corresponding viewBox attribute.
Icons circle-outline, heart-outline and star-outline: Use circle, heart and star instead
this.$events: Use this.$panel.events instead
this.$panel.events.$on: Use this.$panel.events.on instead
this.$panel.events.$off: Use this.$panel.events.off instead
this.$panel.events.$emit: Use this.$panel.events.emit instead
this.$store.dispatch("isLoading"): Use this.$panel.isLoading instead
this.$translation: Use this.$panel.translation instead
this.$store.dispatch("dialog"): Use this.$panel.dialog.open and this.$panel.dialog.close instead
this.$store.dispatch("drag", drag): Use this.$panel.drag = drag instead
k-dropdown: Use k-dropdown-content as standalone instead
k-calendar was renamed to k-calendar-input; k-calendar is still available but only as deprecated alias.