### Breaking changes
`closeBrackets` is now a function, rather than an extension value.
The keymap, special-chars, and multiple-selections packages have been merged into the view package.
The way tooltips are declared changed somewhat to fix an issue with tooltips that stay active across document changes.
Assigning precedences to extension is now done using a plain `precedence` function, rather than a class.
The new state is no longer passed to state field `update` functions (it is part of the transaction anyway now).
The `start` and `end` properties of `Line` have been renamed to `from` and `to` for consistency.
`EditorView.lineAt` is now called `visualLineAt`. Its second argument now defaults to 0.
`EditorView.lineAtHeight` is now called `visualLineAtHeight`.
The `fillConfig` utility is no longer part of the library (the library depends on `Object.assign` now, which provides a standard way to do the same thing).
Completion sources now get all their arguments as properties of the context object.
Language-specific data is now stored in a facet attached to the syntax object, rather than directly in a node prop.
Reconfiguring transactions are now specified in a slightly different way.
### Bug fixes
Fix an issue where the selection was unnecessarily moved to the start of the document when clicking on an unfocused editor.
Work around an issue where sometimes the selection would end in the wrong place on Chrome (because the browser reports a different selection from the one it displays.
Fix an issue where disabling the gutter extension would leave its DOM element in the editor.
### New features
The `EditorView.updateListener` facet can be used to have an external function listening for view updates.
The goto-line package now exports a `gotoLineKeymap` extension.
The new basic-setup package pulls together all the core extensions into a single configuration value.
You can now move through completions with PageUp and PageDown
The editor view now has a [`setState`](https://codemirror.net/6/docs/ref/#view.EditorView.setState) method to reset its state (again).
The autocomplete package now exports functionality for completing to 'snippets' (longer pieces of text with fields that can be filled in one at a time).
`LezerSyntax` instances can now directly specify inherent language data (such as comment syntax).
Language packages now export their supporting extensions (if any) as a separate 'support' value.
Autocompletion can now be configured to ask for case-sensitivity.
Completion results can now specify a `filterDownOn` property to allow the list to be cheaply updated as the user continues typing.
The autocomplete package now exports a `completeFromList` helper to easily construct a completer from a list of options.
`EditorView.dispatch` can now be directly called with transaction specs (rather than always calling `view.state.update` to create its argument).
It is now possible to append extensions from transactions.
Transaction filters can now request the full transaction for the (current) transaction spec if they need it.