Add ability to unfold all unchanged regions in a file. #8548
Description
When viewing file diffs unchanged regions can be unfolded one by one. The GitHub web interface recently gained support for expanding all unchanged regions. It would be great if this feature is brought over to this extension.
The main use case is when viewing changes to markdown files. Here I like to have the file outline view open on the left side, the diff in the middle and a locked preview open on the right. The locked preview only seems to work when regions are expanded.
Alternatively to the feature requested, if we could make the markdown preview render the whole file instead of just the unfolded regions, that would also work for me.