ID 407095 - Processing on the Timeline causes the UI not to update

Problem summary
Processing on the Timeline causes the UI not to update.

Customer reported version
Nuke Studio 11.3v4 

Customer reported platform
Windows 10

Steps to reproduce

1) Open Nuke Studio.

2) Import an image sequence and drag it onto the Timeline. It seems that a higher resolution or longer frames, the easier this issue will be to see.

3) Switch to the Node Graph and try to create nodes or navigate around. Notice that the node graph is not updated unless you switch to the Timeline view and back again.


Alternatively, you can also see this with the Curve Editor:

1) Open Nuke Studio.

2) Import an image sequence and drag it onto the Timeline.

3) Add a Transform soft effect and key any frames to create an animation.

4) Open the Curve Editor and try to pan/zoom in the graph (middle-mouse click and drag or use the scroll wheel)

Expected behavior
The UI should be updating consistently. 


Actual behavior
Processing on the Timeline seems to cause the UI not to update.


Reproduced by Support in:
Nuke Studio 13.2v1 - Windows 10

Nuke Studio 12.2v3 - Windows 10

Nuke Studio 11.3v5 - Windows 10 - macOS 10.13 (High Sierra)

Nuke Studio 11.3v1 - Windows 10

Nuke Studio 11.2v1 - Windows 10

Nuke Studio 11.1v1 - Windows 10

Nuke Studio 11.0v1 - Windows 10 - macOS 10.13 (High Sierra) - Regression


Unable to reproduce bug in:

Nuke 11.3v5 - Linux CentOS 7
Nuke 10.5v8 - Windows 10 - macOS 10.13 (High Sierra)


Earliest version tested
Nuke 10.5v8
- This issue doesn't appear in this version and has regressed (Windows 10 and macOS only).