Interweaving the chart when Dataset is added too much
With the addition of Dataset, the height of the chart decreases. This continues until the chart is no longer visible.
(It is visible at any size, only the number of clicks on the Add Dataset button will be different.)

This problem exists in the main demo of the Chartjs examples Vertical Bar Chart
To solve this problem :
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The Chartjs has a legend property with the name of maxHeight which BitChart has not implemented Legend And of course, using this solution the height of the Legend is limited and all of them don't show.
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When a dataset is added We can limit the maximum number of shown Legends
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We can create a custom HTML legend using a plugin like "this sample"
@msynk
this issue is not important atm for us to work on. I'm removing it from the current sprint
not valid anymore