Describe the bug
Great plugin! Love the good work dedicated to optimization.

Sometimes, when the contents of the buffer change outside the current viewport, the wrong indent guidelines are shown.

To Reproduce
Steps to reproduce the behavior:

1. Open any file (using src/nvim/shada.c in the video)
2. Scroll down to a section with indents
3. Make a change that creates new indents and scrolls the window
4. Scroll the window downward for a bit
5. Press u to undo your edits in step 3
6. Scroll back to the section that you were in during step 5, and a bit lower
7. Observe the wrong indent guides

Expected behavior
The correct indent guides.

Screenshots

Additional context
This is just an example, but the situation has occurred several times during daily use. I've patched a workaround in my local version, where any time a render isn't "lazy", it invalidates the cache for the whole buffer. I haven't noticed any performance impact by doing this, but I haven't measured anything. I'd imagine you'd want to do something more clever, though.