ID 376266 - The Patches>Transform feature on a mask is effecting the texture layer

Problem summary
When using the Patches>Transform feature on a mask, not only the mask is effected but the texture layer as well.

The issue is not effecting procedural layers only paintable layers.

Customer reported version

4.2v1

Customer reported platform

Windows 7 

Steps to reproduce

1) Open Mari and create a project with an object which has multiple patches

2) Create a procedural tiled layer and upload a Tile Image

3) Right click on the Tiled layer and choose Convert to Paintable

4) Right click on the new paintable layer>Layer Mask>Add Mask>Hide all

5) Go to the UV view, choose a patch and paint/bake lines on the mask to reveal the texture

6) Using the Select tool, choose the patch and go to Patches>Quick Copy 

7) Select another patch and go to Patches>Quick Paste and then Patches>Transform>Flip Horizontal

8) The mask is flipped as expected but the texture layer is also flipped which is causing edge bleeding on texture

Workaround
Unknown

Reproduced by support
This bug has been reproduced in:

Mari 4.2v1 - Windows 10 - CentOS 7
Mari 4.1v1 - Windows 10 
Mari 3.4v1 - Windows 10 - MacOS 10.12

Mari 3.0v1 - Windows 10

Mari 2.6v5 - Windows 10

Earliest version tested

2.6v5 - This issue appears to be in all versions of the product

Expected behaviour
Only the mask should be flipped 

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Actual behaviour
Flipping the mask is causing the texture on the paintable layer to be flipped as well

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