Make sure notification is shown at most once
Make sure notification is shown at most once

anton-okolelov/intellij-rust,intellij-rust/intellij-rust,anton-okolelov/intellij-rust,intellij-rust/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,intellij-rust/intellij-rust,Undin/intellij-rust,intellij-rust/intellij-rust,intellij-rust/intellij-rust,anton-okolelov/intellij-rust,anton-okolelov/intellij-rust,anton-okolelov/intellij-rust,Undin/intellij-rust,Undin/intellij-rust,Undin/intellij-rust,Undin/intellij-rust