Intellij plugin, directory open listener

已回答
I am developing an intellij plugin which is in fact an icon pack. I would like to make sure that when folders are opened, their icons change and the same when we close them. How can I achieve this? Is there a Listener class that would do what I want?

As an example on the picture:

1 and 3 are open folders => put icon folder open.

2 folder close => leave icon folder closed

 

Thanks in advance. Ricko

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The IDE does not distinguish this case in general.

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