Hello
I have sandbox and Prod environment.
I work in a patch solution.
In my patch I have a workflow, i modified in the test and that already exist in prod
when I export the patch as a managed solution and import it in prod the modified workflow in test is not modified in prod but the modified date of the workflow is update to the patch import date.
I checked in the xaml file and it's correct.
When i export the workflow as new solution it's ok , the workflow is updated
then i suppose there are limitation to patch : i found somes here :
https://msdn.microsoft.com/en-us/library/mt593040.aspx
Patches support the same operations as solutions, such as additive update, but not removal. You cannot remove components from a solution using a patch. To remove components from a solution perform an upgrade.
but they do not say anything about workflow.