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Action Editor doesn't update until highlighted
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-22 00:21, hash: rB2a06657eca5a, 2.92

Short description of error
As you can see in the video, the action editor doesn't update until focus upon.

Seems to happen in 2.92 as well but haven't had time to check in other versions.

Exact steps for others to reproduce the error

  1. Add a Cube.
  2. Switch to the Animation workspace.
  3. Switch the Dopesheet to Action-Editor.
  4. Add a keyframe to the Cube.
  5. It may update the Action-Editor the first time.
  6. Delete the action and repeat step 4 again. This time it won't update.