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I wonder, if there is an Eclipse plugin for code birdview (preview, visualization, minimap, however it may be called)? I mean, when you see your code in a small preview window and may scroll using this window. Wait, I'll show you...
Like this. (See the column, where the white rectangle is).
Minimap is now present in Eclipse starting version 4.9 Official link to the feature
Here is "Overview" plugin from a deleted by a mod answer that provides a minimap view.
(I don't see a reason for deletion, it's exactly what OP asked for).
I saw this question again today, and found someone working on such a plugin on github. I have no idea how far progressed this project is, but it may be worth checking out:
https://github.com/apauzies/eclipse-minimap-view
Hope this helps!