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Plotly.js rendering in
dcc.Graph
can be async - more so now that we support MathJax in Dash, though there were always some async things like loading geojson. Anyway this hasn't caused any problems in core dash that I'm aware of, but in dash-design-kit, which wrapsdcc.Graph
and passes some information back and forth for theming purposes,extendData
andprependData
could cause tworender
cycles to overlap and drop the new data. This ensures theplotly.js
method calls are sequenced properly, even if they end up delayed relative to the React renders. In my testing the changes here fix DDK (separate PR coming there) and it may fix some as-yet-undiscovered bugs in core DCC.CHANGELOG.md