Plugin to add a line marker in the gutter

I am simply trying to create a plugin which adds some kind of marker for a section of code in the gutter. This will be for the default editor and the diff editor.

Can someone provide a simple example which works? I don't need to navigate anywhere when the user clicks on the marker.

The examples that have been quoted in this forum previously are way too complicated or too old.

 

Thanks

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The samples from SDK Docs (https://github.com/JetBrains/intellij-sdk-docs/tree/master/code_samples) are not "too old" and do work. What exactly is the problem?

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