ID 401811 - Merge mesh doesn't add a source if a "/" is included in the name.

Problem summary
Merge meshes mesh op doesn't add a source if a "/" is included in the name.

Customer reported version
modo.13.0v1

Customer reported platform
windows10

Steps to reproduce

1) Create a simple cube and call it CubeMesh.../

2) Create an empty mesh and call it MeshOp, then go to the MeshOps tab.

3) Select the empty mesh and select Add Operator> Mesh Operations/Edit> Merge Meshes

4) Notice how a source isn't added and a separate Merge Meshes operator is created.

Expected behaviour
The cube mesh should be added as a source.

Actual behaviour
The cube mesh isn't added as a source and a new Merge Meshes operator is created.

Workaround
Remove the "/" from cube meshes name.

Reproduced by support

This bug has been reproduced in:
13.0v1 - Windows 10 - MacOS 10.13 - Centos 7

12.2v2 - Windows 10

12.1v2 - Windows 10

12.0v1 - Windows 10

11.2v3 - Windows 10

11.1v1 - Windows 10

11.0v3 - Windows 10

10.2v4 - Windows 10 - MacOS 10.13 - Centos 7

Earliest version tested

10.2v4 - This issue appears to be in all versions of the product.