editor: Ensure completion menu scrollbar does not become stale #44536
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Only by reusing the previous scroll handle, we can ensure that both the scrollbar remains usable and also that the scrollbar does not flicker. Previously, the scrollbar would hold the reference to an outdated handle.
I tried invalidating the handle the scrollbar uses, but that leads to flickering, which is worse. Hence, let's just reuse the scrollbar here.
Release Notes: