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I would like to explain better. I'm using version 1.2020.07beta8. The problem is shown by the code below. For example, note the margin before and after the word "Lkjhgf".
@startmindmapskinparam { dpi 300 padding 5 shadowing false}
<style>mindmapdiagram {node { margin 5 padding 5}}</style>
+ Zxcvbn++ Qwertyuio+++_ Asd++++_ Mnbvclk+++_ Lkjhgf++++_ Dftretg++ Asdfghj@endmindmap
The picture is the following:
http://www.plantuml.com/plantuml/png/HOxFReGW48VlynJSETIawSqqDkcnFVJQIpCwWAYC1AYksVZkYqgoSFbzy-VBD35XICuoEVGGHyiU0pfn1v4VUIjUg-hC7eai6_5sKkoHvlLWZLDKi0FKCMsJUeSY8ulcCl5CgWWT1cEvE9x6FV_wfUo35B-tRcaPf1G_gmff-xTp1ladFYA1FDCtjqitZLVvQnnweqldKwUWaibqZ6lJ3z0efdBM0m00