### Bug fixes

Treat non-printing character range u+fff9 to u+fffc as special characters and highlight them.

[show-hint addon](https://codemirror.net/doc/manual.html#addon_show-hint): Fix positioning when the dialog is placed in a scrollable container.

### New features

Add [`selectLeft`](https://codemirror.net/doc/manual.html#mark_selectLeft)/[`selectRight`](https://codemirror.net/doc/manual.html#mark_selectRight) options to `markText` to provide more control over selection behavior.