Better mapbox trace / layout-layer *below*#4058
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... to be consistent with traces/*mapbox/ modules
We now handle below logic (mostly) at the subplot level in
subplot.fillBelowLookup() and subplot.belowLookup.
This allows us to handle many edges cases in a cleaner way.
In brief,
+ we collect set trace/layout-layer below value,
OR find their "smart" default value
+ each trace/layout-layer stash a below state value
+ if new below doesn't match old before, we must remove/add layer
+ if many traces/layout have same below value, we place choroplethmapbox,
then densitymapbox, scattermapbox and finally layout layers
in that order.
+ on update, if many traces/layout-layer have same below,
we must in general remove/add all those layers
to have the correct ordering
Additional notes:
- we no longer need to handle below in convert.js routines
- getBelow is now a trace _module.getBelow method, so that it
can get called before mapbox-trace object creation
- new subplot.getMapLayer method to DRY things up
... to Lib.warn users when *below* is invalid.
archmoj
reviewed
Jul 19, 2019
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This PR resolves #4050 and resolves #4049
Commit 8a4e8f1 does most of the work here. Please carefully read the commit message for some rationale and tests.
Commit 853a391 should help users debug. The other commits are cleanup commits.
cc @plotly/plotly_js @nicolaskruchten