How to get a scroll bar area more similar to other editors?

[tobimensch]

Before I cause any confusion: I don't want a typical scroll bar (that you can drag with the mouse and click on), and I accept that spacemacs has its own paradigms.

However.

I find it really useful that in modern editors(and IDEs) you get hints in the scrollbar area, so that you can directly see where in the file there are syntax errors or changed lines or something else of that sort. I experienced how useful this can be with QtCreator, netbeans and IntelliJ.

For example I can get an indicator (+) about an added line now with spacemacs on the right side of the buffer, but only if I'm already in the region of that line. If I want to know where changes were made (or where errors/warnings/... are) in a huge source file, I don't want to hit page down a hundred times, instead I want to see all of them indicated in a scroll bar like visual area. The top of this area should represent line 1, and the bottom should represent the last line, the middle should represent 50%. There should also be an indicator on this "scroll bar" for the cursor position.

[tobimensch]

Looks like it could be implemented with this package:
https://github.com/Fuco1/indicators.el

There's just one major limitation

If multiple indicators fall on the same physical line they will inherit the color of the indicator with highest priority (this is a limitation of emacs fringes and cannot be fixed). You can specify the priority with keyword argument :priority number.

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