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It should be possible to remove opacity from levels on a treemap #4700
I'm using a treemap with levels but only the most deep level have color. When Highcharts draw it, it puts a "fill" with opacity on top of it. That breaks the color that I selected.
When I drilldown until the most deep level, it shows the data correct and when I drillup, only the part that I drilledown show the correct color.
added a commit
Feb 23, 2016
Thanks for reporting, and my apologies for the late reply. This issue will be fixed in an upcoming maintenance release.
Internal Note: Discuss if the naming and behavior of this option is correct. When this is included in a maintenance, remember to add the option to the API.