v1.51.3

Fixed

• Fix Plotly.Plots.resize edge cases ensuring now that
  its promises always resolve [#4392]
• Fix position of link hover labels in vertical sankey [#4404]
• Fix box autorange for traces with "inverted" notched [#4388]

v1.51.2

Fixed

• Fix texttemplateformatting on axes that define tick prefixes and suffixes [#4380, #4384]
• Fix cmin and cmax computations during color value updates on shared color axes [#4366]
• Fix contour and histogram2dcontour legend item rendering when reversescale is turned on [#4356]
• Fix contour and histogram2dcontour legend item rendering when set to a shared color axis [#4356]
• Handle missing vertexcolor and facecolor during mesh3d rendering [#4353]
• No longer coerce contour and colorscale attributes for mesh3d when not needed [#4346]
• Remove a duplicate function call in parcoords code [#4357]
• Include opacity in the surface trace plot schema [#4344]
• Mention legend.bgcolor default in attribute description [#4362]

v1.51.1

Fixed

• Fix scattergl mising points plot and react (bug introduced in 1.33.0) [#4323]
• Skip non-numeric values in image trace plot [#4325]

v1.51.0

Added

• Add image trace type [#4289, #4307, #4313, #4319]
• Add automargin attribute in pie traces, enabling outside text labels
  to push the margins [#4278]
• Add title.standoff attribute to cartesian axes, setting the
  distance in pixels between the tick labels and the axis title [#4279]
• Add hoverongaps attribute to heatmap and contour traces,
  for suppressing hover labels on missing data [#4291]
• Add args2 attribute to updatemenus buttons which can be used to
  create toggle buttons [#4305]
• Add zh-CN locale [#4276, #4310]

Changed

• Introduce workarounds for "common" (aka axis) hover label clipping
  about the graph's viewport [#4298]
• No longer accept trace domain settings where end is not greater
  than start [#4304]

Fixed

• Fix streamtube coloring and positioning when generated
  with non-xyz grid signatures [#4271]
• Fix trace-type update calls on mapbox subplots [#4295]
• Fix width of box and violin items on log position axes [#4283]
• Fix box/meanline offset for one-sided vertical violin traces [#4314]
• Fix missing gaps in some scattergl line traces [#4316]
• Fix event data during scroll on gl3d subplots with orthographic projections [#4292]
• Handle data with identical positions in cone traces [#4306]
• Handle invalid entry before trying to render treemap trace [#4312]
• Fix heatmap and contour description for connectgaps [#4284]

v1.50.1

Fixed

• Guard against mirrored + automargin anchor:'free' axes (bug introduced in 1.50.0) [#4273]
• Fix streamtube trace starts case when missing a dimension [#4265]
• Fix scattergl performance for drawing legend items of traces with typed arrays [#4268]
• Fix legend item style for markers with typed array colors [#4268]
• Do not attempt to re-hover on exiting subplots [#4269]
• Fix "layout first" transition race condition [#4262]

v1.50.0

Added

• Add treemap trace type [#4185, #4219, #4227, #4242]
• Add texttemplate attribute to all traces that support on-graph text [#4071, #4179]
• Add date custom formatting in hovertemplate and texttemplate e.g.
  '%{x|%b %-d, %Y}' [#4071]
• Add transition support to bar trace length, width, on-graph text positioning,
  marker style and error bars [#4180, #4186]
• Add attribute count, colorscale support and many hoverinfo / textinfo flags
  to sunburst traces [#4185, #4245]
• Add constraint info to parcats click and hover events [#4211]
• Add support for legend scrolling via touch interactions [#3873, #4214]
• Add ru and uk locales [#4204]
• Publish minified dist npm packages for the main plotly.js bundle and
  all our partial bundles [#4169]

Changed

• Cap the number of redraws triggered by the auto-margin routine,
  which should prevent all potential infinite redraw loops [#4216]
• Improve cartesian axis draw performance by (1) computing its bounding box
  only when required and (2) using a bounding-box computation cache [#4165]
• Log message when margin-push values are too big to be considered during
  auto-margin computations [#4160]
• Log message when legend position is constrained into graph viewbox [#4160]
• Process layout image using data URI synchronously [#4105]
• Adapt default axis ranges to rangemode values 'tozero' and 'nonnegative' [#4171]
• Show zeroline even when no grid lines are present [#4189]
• Use mapbox-gl version 1.3.2 [#4230]
• Make touchmove event listener non passive on mobile drag [#4231]
• Improve streamtube trace description [#4181]
• Improve indicator trace description [#4246]
• Improve legend x and y attribute descriptions [#4160]

Fixed

• Fix attempt at fixing gl3d in Chrome 77 problems [#4256]
• Fix numerous legend positioning bugs [#4160]
• Fix numerous axis automargin bugs [#4165, #4216]
• Correctly handle <br> and \n in scattermapbox on-graph text [#4176]
• Fix scattergl hover over nulls (bug introduced in 1.45.0) [#4213]
• Correctly remove off-screen annotations during pan interactions
  (bug introduced in 1.40.0) [#4170]
• Fix contour and contourcarpet label formatting via colorbar settings
  (bug introduced in 1.48.0) [#4177]
• Fix background rectangle dimensions for horizontal grouped legends [#4160]
• Correctly handle non-linear axis types during transitions [#4249]
• Fix branchvalues: 'total' for generated sunburst sectors [#4253]
• Fix Download plot translations [#4148]
• Fix fr translations for "Click to enter --- title" [#4204]
• Fix tiny zoombox behavior [#4188]
• Fix rendering of constraint contours with rounded-off edge path [#4102]
• Fix "autoscale" modebar button bug where it sometimes toggled axis showspikes [#4241]
• Fix multi-axis transition axis-to-axis range "leaks" [#4167]
• Fix toggleHover and resetViews modebar buttons for
  some partial bundle + graph setups [#4184]
• Correctly list color-rgba module as dependency [#4207]
• Fix third-party dependency listing for gl-cone3d and gl-streamtube3d [#4208, #4215]
• Fix line.width attr declaration in *contour traces [#4218]
• Remove hover attribute from carpet and contourcarpet schema
  (as they do not support hover yet) [#4102]

v1.49.5

Fixed

• Clear rejected promises from queue when calling Plotly.react [#4197]
• Do not attempt to remove non-existing mapbox layout source and layers [#4197]
• Invalid mapbox layout layers with blank-string tile entries [#4197]
• Fix hover labels for choroplethmapbox with number locations items [#4197]

v1.49.4

Fixed

• Fix access token validation logic for custom mapbox style URLs
  (regression introduced in 1.49.0) [#4144]
• Fix rendering of cartesian ticks under mirror: 'all' [#4140]

v1.49.3

Fixed

• Fix graphs with visible: false sankey traces [#4123]
• Fix scattergl with mode: 'text' and text arrays longer
  than the coordinates arrays [#4125, #4126]
• Fix rangeslider positioning when left margin is pushed
  by other components [#4127]

v1.49.2

Fixed

• Fix gl3d hover behavior when multiple points share identical position [#4096]
• Fix mapbox-gl@1.1.1 dependency version listing in package.json [#4094]
• Fix decimal and thousands separator declaration for Italian (it) locale [#4122]
• Fix indicator steps attribute declaration [#4115]
• Performance fix - use Axes.prepTicks (not Axes.calcTicks) for indicator
  number and delta formatting [#4099]