Problem summary
When copy/pasting values of the 'Fall Off' group in a 'KatanaSpotlight' (Inside a GafferThree node) to another light, the values will be copied but the 'Dropdown Triangle' will not light up yellow. (will not display that values are locally edited in the group)
This UI issue may confuse users at it looks like their values have not been copied over until they open the group.
Steps to reproduce
1. Add a GafferThree node.
2. Add two lights using 'Right Click -> Add -> Light -> Material tab -> Add Shader -> Viewer Light -> KatanaSpotlight'
3. In the first light in the Parameters tab, set some values on some of the parameters under the Fall Off group.
4. Right click on Fall Off and select copy.
5. Switch to the second light and make sure the Fall Off group is closed.
6. Right click on Fall Off and select 'Paste -> Paste'
Result: The values will be copied into the group, but the 'Dropdown Triangle' will not be 'Yellow'
Workaround
Open the group before copying the values into it.
Reproduced by support
Katana2.6v3 - CentOS6.9 - Windows 7
Katana2.6v1 - CentOS6.9 - Windows 7
Katana2.5v7 - CentOS6.9 - Windows 7
Katana2.5v1 - CentOS6.9 - Windows 7
Katana2.1v6 - CentOS6.9
Earliest version tested
Katana2.1v6
Expected behaviour
The 'Dropdown Triangle' should light up do display that it contains localised values.
Actual behaviour
The 'Dropdown Triangle' does not light up, yet there are localised values inside.