Remember menu scroll position when opening a file

[Greenheart]

The problem

When opening a file at the bottom of a long list of files and going back to the menu again, the list scrolls back up to the top.

This makes it annoying when searching for a specific file and you have to scroll down to the bottom every time.

By getting back to the same scroll position in the main menu automatically, UX would be improved.

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Solution

1. Save the scroll position when the main menu is closed and before the file is opened.
2. When navigating back to the menu and its file list, set the scroll position based on the latest stored value.