### Bug fixes

Make the editor notice widget height changes to automatically adjust its height information.

Fix an issue where widget buffers could be incorrectly omitted after empty lines.

Fix an issue in content redrawing that could cause `coordsAtPos` to return incorrect results.

### New features

The static `RectangleMarker.forRange` method exposes the logic used by the editor to draw rectangles covering a selection range.

Layers can now provide a `destroy` function to be called when the layer is removed.

The new `highlightWhitespace` extension makes spaces and tabs in the editor visible.

The `highlightTrailingWhitespace` extension can be used to make trailing whitespace stand out.