### Breaking changes

Lezer and lezer-tree have been upgraded to 0.12, which introduces a few breaking changes.

`ChangeDesc.mapPos` now returns null instead of -1 when reporting a deletion.

`EditorView.posAtCoords` now returns null, rather than -1, when it fails to find a position.

### Bug fixes

Fix an issue where Chrome's shift-enter shortcut confused the editor.

Clicking on the completion list scrollbar no longer selects the first completion.

### New features

The lang-json package now exports a `jsonParseLinter` function that produces a linter based on `JSON.parse`.