ID 411109 - Transform/mirror patch feature does not work when using on a singular node

Problem summary
Transform/mirror patch feature does not work when using on a singular node which is not connected to a channel 

Customer reported version
mari.4.5v1

Customer reported platform

Steps to reproduce

1) Open Mari and an example project 

2) Open the NodeGraph and delete all channels/nodes/shaders

3) Create a paint node, press 1 to view the node and draw on one of the UV patches

4) Select the patch>right click>Patches>Transform>Flip Vertical 

result: Nothing occurs 

Expected behaviour
Transform or Mirror patches should work regardless of the use of a channel 

Actual behaviour
Transform/Mirror patches feature does not work if there is no channel attached to the node 

Workaround
Attach the paint node to a channel 

Reproduced by support
This bug has been reproduced in:

4.5v2 - Windows 10 - CentOS 7 

3.0v1 - Windows 10 - CentOS 7 

Earliest version tested
3.0v1 - This feature did not exist before this version