plotly/plotly.js v1.50.0 on GitHub

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]

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]

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]