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Currently, every time a script is run, a new output tab is opened. The number of open tabs quickly accumulates. Ideally the same Output tab would be used. This is also consistent with how other scripts are run from NetBeans (e.g., Ruby).
Did you click on double chevron green icon in the output window to re-run the script? If yes, it shouldn't open a new output window! The run button always opens a new output window.
Right. Traditionally a script reuses the same output window. I case in this case, however, the issue arises that the first script may very well still be running. I'll change it to INVALID for now.