### Bug fixes

Fix an issue where editors with large vertical padding (for example via `scrollPastEnd`) could sometimes lose their scroll position on Chrome.

Avoid some unnecessary DOM measuring work by more carefully checking whether it is needed.

### New features

The new `elementAtHeight`, `lineBlockAtHeight`, and `lineBlockAt` methods provide a simpler and more efficient replacement for the (now deprecated) `blockAtHeight`, `visualLineAtHeight`, and `visualLineAt` methods.

The editor view now exports a `documentTop` getter that gives you the vertical position of the top of the document. All height info is queried and reported relative to this top.

The editor view's new `viewportLineBlocks` property provides an array of in-viewport line blocks, and replaces the (now deprecated) `viewportLines` method.