Ghost text flicker when undoing accept part

[rebornix]

Testing #172029

https://user-images.githubusercontent.com/876920/214391010-4dc4812d-6cdd-4185-9ee0-fa944223b90b.mov

In the second part of the video, undoing the accepted part will remove and then insert spaces which leads to the flicker.

[vscodenpa]

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Happy Coding!

[hediet]

This is a bug in copilot. It happens when the range gets empty (start = end) and the predictive cache update now moves the entire inline completion instead of just the end.