IdeaVim "tray style" setting window & icon
Answered
Just as below icon shows, it's IdeaVim plugin setting page. it's like OS tray. Is there any document about how to implement it?

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See com.intellij.openapi.wm.StatusBarWidgetFactory extension point.
https://plugins.jetbrains.com/intellij-platform-explorer?extensions=com.intellij.statusBarWidgetFactory for samples from OSS Plugins (including vim)