ID 378837 - Creating a new layer is causing a docked Curve Editor to lose its functionality

Problem summary

Creating a new layer is causing a docked Curve Editor to lose its functionality

Customer reported version

4.2v2

Customer reported platform

windows

Steps to reproduce

1) Open Mari and create a new project

2) Go to the Layers Palette and Add Adjustment Layer

3) Create a Brightness Lookup or a Color Lookup layer

4) Open the Curve Editor for the according Lookup layer and dock it 

5) Create a New Layer

6) Adjust the curve in the docked Curve Editor

7) The docked Curve Editor does not have any functionality

Workaround
Close the Curve Editor and open it once more.

Reproduced by support
This bug has been reproduced in:

Mari 4.2v2 - Windows 10 - CentOS7

Mari 4.2v1 - Windows 10 

Mari 4.0v1 - Windows 10 - CentOS7

Earliest version tested

4.0v1 - This feature did not exist before this version

Expected behaviour
The Curve Editor should adjust the texture accordingly

Actual behaviour
The Curve Editor loses its functionality and does not adjust the texture