Memory leak in Sequencer graph editor with a lot of keys

Steps to Reproduce
  1. Open the attached project
  2. Open the only sequence in the project
  3. Enable graph view from the toolbar
  4. Select the Static Mesh Component Track
  5. Open Task Manager and watch UE4Editor memory usage

Result: Memory steadily increases at about 200mb or more per second
Expected: Probably some slow down with this many keys and a one-time memory increase.

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ComponentUE - Anim - Sequencer
Affects Versions4.164.17
Target Fix4.18
Fix Commit3616502
Main Commit3621569
Release Commit3643070
CreatedJun 5, 2017
ResolvedAug 30, 2017
UpdatedApr 27, 2018
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