ID 344010 - Colour Curve filter dialog cannot be edited

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Problem summary
Colour Curve filter dialog cannot be edited


Customer reported version
4.0v3
Customer reported platform
centos6

Steps to reproduce
1. Click on 'Filters' from the menu
2. Select 'Colour Curves'.
3. Click the 'Colour Curve' icon of any RGB channels. 
4. A color curve filter graph should display
5. Attempt to move any of the sliders on the graph.
Result: The graph is unresponsive

Workaround
n/a
Reproduced by support
Mari 4.0v3 - CentOS7 - Windows 10
Mari 4.0v1 - CentOS7 - Windows 10
Result: Graph is unresponsive

Unable to repro:
Mari 3.3v1 - CentOS7 - Windows 10 - Mac 10.12.6
Mari 3.2v1 - CentOS7 - Windows 10 - Mac 10.12.6
Result: Works as intended

Earliest version tested
3.2v1 - Graph works as intended. It works as intended in 3.3v1.

Expected behaviour
Adjust color settings of the graph

Actual behaviour
Graph is unresponsive
 

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