Workflow actions indistinguishable from user changes

[ecarter]

• someone writes a workflow action that modifies a user-modifiable ticket field
• user selects that action, and previews the change
• user selects a different action
• user previews or submits changes

The changes made by the workflow action will still be present; they will not be reverted.

Internally, the code does not differentiate between user changes and workflow changes across a preview.

The correct behavior here, particularly in cases where the user modifies the same fields as the workflow, is open for debate.