no change indicator in scroll bar

[eyal670]

add changes indicator to scroll bar like in git diff tab for a better overview of all changes see screenshot as an example: https://www.screencast.com/t/2jSdc6Xo3xc

also, line numbers are a must for every developer

great job, thank you

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[harrybiddle]

Plus one! It is quite difficult to see where in the file the changes are.