### Bug fixes

Properly handle bidirectional text in `posAtCoords`.

Avoid computing a zero character width (leading to divisions by zero) when the editor is hidden and the browser doesn't have a layout for it.

### New features

The `posAndSideAtCoords` method is an extended version of `posAtCoords` that also tells you which side of the position the coordinates are associated with.

Add support for block wrappers, decoration-like things that allow extension code to create DOM nodes around groups of lines.