Plotly

Added
- Sankey diagram with new trace type `sankey` [[1591](https://github.com/plotly/plotly.js/pull/1591), [#1664](https://github.com/plotly/plotly.js/pull/1664)]
- Add `hoverlabel` trace and layout attributes to customize hover label colors
and fonts [[1582](https://github.com/plotly/plotly.js/pull/1582)]
- Add `marker.gradient` attributes for `scatter`, `scattergeo`, `scatterternary`
and `scattercarpet` traces [[1620](https://github.com/plotly/plotly.js/pull/1620)]
- Add `sort` transform [[1609](https://github.com/plotly/plotly.js/pull/1609)]
- Add `preservegaps` `filter` transform attribute [[1589](https://github.com/plotly/plotly.js/pull/1589)]
- Add `!=` (not equal) `filter` transform operation [[1589](https://github.com/plotly/plotly.js/pull/1589)]
- Add `labelfont`, `tickfont` and `rangefont` attributes for `parcoords` traces
[[1624](https://github.com/plotly/plotly.js/pull/1624)]
- Pass DOM mouse event on `plotly_clickannotations` events [[1652](https://github.com/plotly/plotly.js/pull/1652)]

Changed
- Performance optimization for range sliders and Drawing cache [[1585](https://github.com/plotly/plotly.js/pull/1585)]

Fixed
- Fix `scattergl` marker symbol positioning (bug introduced in 1.25.0) [[1633](https://github.com/plotly/plotly.js/pull/1633)]
- Fix gl2d zoom where two clicks would trigger a zoom box (bug introduced 1.26.0) [[1632](https://github.com/plotly/plotly.js/pull/1632)]
- Fix legend double click handler for `carpet` traces [[1636](https://github.com/plotly/plotly.js/pull/1636)]
- Fix `restyle` for `scattercarpet` for style attributes with array support [[1641](https://github.com/plotly/plotly.js/pull/1641)]
- Fix `restyle` for array layout components when more than 10 items are present
[[1639](https://github.com/plotly/plotly.js/pull/1639)]
- Fix select-box and lasso selections so that they don't include bad-data items
[[1656](https://github.com/plotly/plotly.js/pull/1656)]
- Fix `restyle` for contour `zmin` and `zmax` [[1653](https://github.com/plotly/plotly.js/pull/1653)]
- Fix `scatter` text node transitions [[1616](https://github.com/plotly/plotly.js/pull/1616), [#1626](https://github.com/plotly/plotly.js/pull/1626)]

Fixed
- Fix `pie` fill opacity [[1615](https://github.com/plotly/plotly.js/pull/1615)]
- Fix `contour.value` declaration for `contourcarpet` trace [[1612](https://github.com/plotly/plotly.js/pull/1612)]

Added
- Carpets plots with new trace types: `carpet`, `scattercarpet` and
`contourcarpet` [[1595](https://github.com/plotly/plotly.js/pull/1595), [#1596](https://github.com/plotly/plotly.js/pull/1596)]
- Axis constraints with new cartesian and gl2d axis attributes `scaleanchor` and
`scaleratio` [[1522](https://github.com/plotly/plotly.js/pull/1522)]
- Annotations `width`, `height`, `valign` and `xshift` and `yshift` attributes
[[1551](https://github.com/plotly/plotly.js/pull/1551), [#1590](https://github.com/plotly/plotly.js/pull/1590)]
- Hover text over annotations with `hovertext` and `hoverlabel` attributes
[[1573](https://github.com/plotly/plotly.js/pull/1573), [#1590](https://github.com/plotly/plotly.js/pull/1590)]
- Add `hovertext` attribute to trace types that can show `text` values on graph
to allow setting hover text independently [[1523](https://github.com/plotly/plotly.js/pull/1523)]
- Add `spikes` interactions functionality to cartesian subplots [[1461](https://github.com/plotly/plotly.js/pull/1461)]
- Pass mouse DOM mouse event during `plotly_click`, `plotly_hover` and
`plotly_unhover` [[1505](https://github.com/plotly/plotly.js/pull/1505)]
- Add `visible` attribute to cartesian and gl3d axes to easily make them
disappear [[1595](https://github.com/plotly/plotly.js/pull/1595), [#1599](https://github.com/plotly/plotly.js/pull/1599)]
- Make `deleteFrames(gd)` delete all frames [[1531](https://github.com/plotly/plotly.js/pull/1531)]

Changed
- Lock down `gl-plot3d` and `matrix-camera-controller` dependencies to include
latest memory management improvements [[1570](https://github.com/plotly/plotly.js/pull/1570)]
- Performance improvements for `category` axes [[1544](https://github.com/plotly/plotly.js/pull/1544)]
- Skip overhead for `showLink` config option is false [[1557](https://github.com/plotly/plotly.js/pull/1557)]
- Optimize scatter trace sorting on updates [[1555](https://github.com/plotly/plotly.js/pull/1555)]
- Lock down `gl-scatter2d-sdf` dependency to `1.3.4` while waiting for bug fix
there [[1572](https://github.com/plotly/plotly.js/pull/1572)]

Fixed
- Fix bar sizes of traces with (x,y) `NaN` items [[1519](https://github.com/plotly/plotly.js/pull/1519)]
- Fix handling of `NaN` items in array-ok attributes for `scattergeo` and
`scattermapbox` traces [[1538](https://github.com/plotly/plotly.js/pull/1538), [#1564](https://github.com/plotly/plotly.js/pull/1564)]
- Fix hover label position for `bar` traces with set `width` [[1527](https://github.com/plotly/plotly.js/pull/1527)]
- Fix `restyle` for attribute containers [[1536](https://github.com/plotly/plotly.js/pull/1536)]
- Fix `restyle` exception for `scattergl` traces with no `y` data [[1567](https://github.com/plotly/plotly.js/pull/1567)]
- Fix animation of text nodes that contain `<br>`s [[1602](https://github.com/plotly/plotly.js/pull/1602)]
- Fix `toImage` for mapbox subplots when access token is set in the config
options [[1598](https://github.com/plotly/plotly.js/pull/1598)]
- Emit `plotly_hover` on `pie` traces when `hoverinfo: 'none'` [[1505](https://github.com/plotly/plotly.js/pull/1505)]
- Pass trace info during `plotly_click` on `pie` traces [[1505](https://github.com/plotly/plotly.js/pull/1505)]
- Pass through the wheel event if the scrollbar is at the very top or bottom
[[1588](https://github.com/plotly/plotly.js/pull/1588)]

Fixed
- rm `const` token from dist bundles that depend on `big-rat`,
see <https://github.com/rat-nest/big-rat/pull/4> for more details.

Fixed
- Fix `restyle` for `scattergl` traces with array `marker.size` (bug introduced
in `1.25.0`) [[1521](https://github.com/plotly/plotly.js/pull/1521)]
- Fix `relayout` for `histogram2dcontour` traces [[1520](https://github.com/plotly/plotly.js/pull/1520)]
- Do not unnecessary mutate `parcoords` full trace objects when computing
line color and colorscale [[1509](https://github.com/plotly/plotly.js/pull/1509), [#1508](https://github.com/plotly/plotly.js/pull/1508)]
- Do not unnecessary coerce trace opacity in `parcoords` traces [[1506](https://github.com/plotly/plotly.js/pull/1506)]

Added
- Double click handler on legend items to isolate 1 traces / group on graph
[[1432](https://github.com/plotly/plotly.js/pull/1432)]

Changed
- Use signed distance fields (SDF) method to render heterogeneous `scattergl`
traces improving performance [[1398](https://github.com/plotly/plotly.js/pull/1398)]
- Improve first-render performance in `scattergl` traces by only creating
visible objects [[1444](https://github.com/plotly/plotly.js/pull/1444)]
- Use `color-rgba` instead of `tinycolor2` to convert plotly color definitions to
WebGL buffers improving performance for gl3d and gl2d traces [[1443](https://github.com/plotly/plotly.js/pull/1443)]
- Bump `uglify-js` minifier to version `2.8.12` [[1450](https://github.com/plotly/plotly.js/pull/1450)]

Fixed
- Fix 3D trace ordering on visibility toggle [[1466](https://github.com/plotly/plotly.js/pull/1466)]
- Fix gl2d trace ordering on visibility toggle [[1444](https://github.com/plotly/plotly.js/pull/1444)]
- Fix autorange routine for bar traces [[1475](https://github.com/plotly/plotly.js/pull/1475)]
- Fix shapes and images referencing a missing subplot [[1481](https://github.com/plotly/plotly.js/pull/1481)]
- Ensure array attributes can be restyled in all situations [[1488](https://github.com/plotly/plotly.js/pull/1488)]
- Fix XYZ-column-to-2D-z convert routine for columns containing nulls [[1491](https://github.com/plotly/plotly.js/pull/1491)]
- Fix range slider display when anchored to log axes [[1472](https://github.com/plotly/plotly.js/pull/1472)]
- Make sure all trace types can be deleted from range sliders [[1472](https://github.com/plotly/plotly.js/pull/1472)]
- Let the `parcoords` object tree be garbage collected on `restyle` [[1479](https://github.com/plotly/plotly.js/pull/1479)]
- Bring back support for histogram colorscales (bug introduced in `1.21.3`)
[[1500](https://github.com/plotly/plotly.js/pull/1500)]
- Support all axis types for clicktoshow annotations [[1497](https://github.com/plotly/plotly.js/pull/1497)]
- Fix 3D margin relayout calls (bug introduced in `1.24.1`) [[1494](https://github.com/plotly/plotly.js/pull/1494)]
- Fix `relayout` when trying to update empty axis containers (bug introduced in
`1.24.0`) [[1494](https://github.com/plotly/plotly.js/pull/1494)]