v0.2.0

Added

• CodeMirror's highlighting tags. The new tags package is
  @lezer/highlight's vocabulary: every standard tag and the Definition,
  Constant, Function, Standard, Local and Special modifiers, falling
  back from specific to general the way CodeMirror's do. chroma's tokens are
  tagged with them, punctuation down to parens, braces and separators.
• HighlightStyle, as in CodeMirror. NewHighlightStyle takes TagStyle
  specs (tags, color, bold, italic, underline, line-through) and resolves a
  token's style like HighlightStyle.define: the most specific styled tag
  wins, and a later spec for a tag replaces an earlier one. Specs gives
  back a style's specs, so a theme can extend another's with specs of its own.
• Ported CodeMirror themes: OneDark (@codemirror/theme-one-dark), and
  Dracula, GitHubLight, GitHubDark and Nord (@uiw/codemirror-themes),
  spec for spec. The demo takes -theme.

Changed

• Breaking: themes style tags, not classes. Theme.Syntax, TokenStyle and
  TokenClass are gone. A theme of your own sets Theme.Foreground (what
  Syntax[Plain].Color was) and Theme.Highlight, a *HighlightStyle built
  from TagStyle specs naming tags. DarkTheme and LightTheme keep their
  colors, and a few tokens move with the finer tags: self/this take the
  keyword color, HTML entities the string color, exception names the type
  color, symbols and atoms the literal color; markdown headings and strong text
  are bold, emphasis italic, links underlined.

Fixed

• Resizing a view no longer redraws every row. A View, Split or
  DiffView whose width changed every frame (a pane edge being dragged)
  composed every visible row again each frame; now a row is composed again
  only when the cells it shows change.