[FR] Is this warning really appropriate?

[juliohm]

Whenever I call a plot recipe twice that uses a colorbar by default, I get this warning:

I wonder if this is something that could be fixed? To me it seems like we should be able to plot multiple series on a scene and get the colorbar updated? Is the warning just reflecting a missing implementation?

[mkborregaard]

It's nice enough with the information, but it could be an @info and less defensively phrased (keeping just the first sentence)

[juliohm]

Is it something that is not amenable to fix? The way that series get plotted one after another inhibits the update of the colorbar in the current design, is that it?

[daschw]

Maybe we could check if the two series share the same color gradient and omit the warning/info in that case.

[juliohm]

That seems reasonable and very useful to have.

[juliohm]

Another warning that could go away:

[isentropic]

Perhaps these warnings should be handled by Plots, not backends? If we were to cross check the series range and colorbar, it can only be checked in Plots

[juliohm]

I think a quick removal of the warnings would already be an improvement. They are not helping much.

[isentropic]

We cannot just remove the warnings, if this gets unnoticed it might produce wrong plots I think. For now, it could be changed to @info but that is it

[juliohm]

These two warnings show up in this tutorial: https://www.youtube.com/watch?v=Ee8K2Dxp-2k

The second warning could be removed without problems in my opinion. People will notice the issue with polar grid labels anyways.

[yha]

Maybe we could check if the two series share the same color gradient and omit the warning/info in that case.

The check does exist in the code, but stopped working because comparison of color gradients was broken in the transition to ColorSchemes. Should be fixed now on PlotUtils master (JuliaPlots/PlotUtils.jl#99).
I still think this should be a warning and not @info, because it means the colorbar is probably wrong. Once comparison of gradients works correctly, I can't think of a scenario where this warning is emitted and the plot is actually correct.

[juliohm]

Closing as no longer valid.