It appears that if a slate widget becomes disabled, the MouseUp events won't fire. As a side effect, a mouse capture will not be released if something causes the button to become disabled before the mouse is released.

Steps to Reproduce
  1. Create a new widget with a button
  2. Set the button to disable itself on press
  3. Press the button and observe that it does not release mouse capture

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ComponentTools - Slate
Affects Versions4.
Target Fix4.16
Fix Commit3356028
Main Commit3379345
CreatedMar 8, 2016
ResolvedApr 26, 2017
UpdatedMay 9, 2017