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Intercell spacing in cell in tree

 
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how can i increase the intercell spacing in tree.Right now i am setting Empty border to increase the intercell spacing.I guess it is hit on performance.please let me know ,if any better way of doing it.
Thanks
 
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IntelliJ IDE Spring Java
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How are you adding the border? I've run the code below through a profiler, and adding an empty border actually made the memory footprint go *down* due to less cells being able to be displayed on the screen...

 
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