"close all" equivalent for HeatMap charts
If you're creating a bunch of heatmaps:
for i=1:10 HeatMap(rand(5,5)) end
then you are left with a bunch of open shape windows. Although they are not really "windows", they are "HeatMap windows" (tangential question: why ???).
If you have a bunch of normal shapes, you can close them by typing
. But that does nothing for HeatMap windows. So ... what's the alternative?
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