ColumnState becomes unintentionally dirty when there are hidden columns

[ghsolomon]

Example:

Initial State:

• Column-A: visible
• Column-B: hidden
• Column-C: visible

Action:
User moves Column-C to the LEFT of Column-A.

Intermediate State:

• Column-C: visible
• Column-A: visible
• Column-B: hidden

Action:
User moves Column-C BACK to the RIGHT of Column-A

Final State

• Column-A: visible
• Column-C: visible
• Column-B: hidden

The Final State is dirty, but from the user's perspective it should really be clean -- because Column-B is hidden, the Final State and Initial State are materially the same to the user.