Button in plugin menu panel
Answered
Hi,
I'd like to add an button on the red circle in the image bellow.
I don't know how this is called (plugin menu ? toolbar ?), so it's pretty hard to find documentation on this.
I've been trying to use actions, but I don't know if it's really what I should be looking for.

Thanks for your help.
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This is a toolwindow's header, custom actions can be added using
com.intellij.openapi.wm.ToolWindow#setTitleActions
See https://plugins.jetbrains.com/docs/intellij/tool-windows.html for introduction.