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TreeView scroll hang #2271

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SamBent commented Dec 2, 2019

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Description

Certain scrolling operations cause TreeView to hang. There are two causes:

  1. Floating-point catastrophic cancellation while detecting an element’s position within the viewport
  2. Inappropriate “offset replacement” when filling the “before” cache. (Internal concepts, I’d need a whiteboard to explain fully.)

Customer Impact

Hang.

Regression

No. (Port of servicing fix for .NET 4.7 - 4.8)

Risk

Low

Fixes #1962
WPF TreeView, virtualization, scroll, freeze

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