v1.38.0

Added

• Add 3D cone traces to visualize vector fields [#2641, #2647]
• Add ability to interactively change length and rotate line shapes [#2594]
• Add toImageButtonOptions config object to override to-image mode bar button options [#2607]
• Add Brazilian Portuguese (pt-br) locale [#2622]
• Add Italian (it) locale [#2632]

Changed

• Improve cartesian scroll and pan (mostly) performance for graphs with
  many marker or/and text nodes [#2623]
• Improve splom first render and axis-range relayout performance [#2628]
• Improve multi-axis axis-range relayout performance by updating minimal set of
  axes instead of all axes [#2628]
• Use "grab" cursor to denote when annotations and shapes are draggable [#2594]
• Ignore zero and negative link values in sankey traces [#2629]
• Ignore unused and malformed links sankey traces without logging [#2629]

Fixed

• Fix scattergl error bar computations when input value are numeric strings [#2620]
• Fix scattergl error bar computations for x0/dx and y0/dy coordinates [#2620]
• Fix violin kde span edge cases [#2650]
• Make sankey traces accept numeric strings [#2629]
• Fix axis range edits under axis constraints [#2620]
• Fix "sloppy click" event emission during cartesian zoom [#2649]
• Fix layout grid validation which lead to exceptions [#2638]
• Fix parcoords rendering in old Safari version [#2612]
• Link to https://get.webgl.org instead of http version in no WebGL message [#2617]