The workspaces module is basically built on top of revisions, thus it makes sense to be able to use the comparison diff provides also inside workspaces.
On Vanilla Drupal 9:
This will fail displaying a message like "This form can only be submitted in the live workspace".
Additionally, see 📌 Incompatible with diff module Needs work where there are some other blockers to supporting this.
Using the API which 📌 Add an API for allowing modules to mark their forms as workspace-safe Needs work would introduce, we can add an event subscriber that marks the comparison form "workspace safe".
Also, a mild refactor of the Diff form to make getting the revision IDs easier.
Needs work
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The IS is only one aspect of things needed. There is another bit as seen in 📌 Incompatible with diff module Needs work . Let's bundle both here.
acbramley → changed the visibility of the branch 3293558-compare-in-workspaces to hidden.
acbramley → changed the visibility of the branch 2.x to hidden.