Breadcrumbs in GMF Editors
When using Diagram Partitioning in GMF, one problem is that you are never sure where in the model you are currently editing when opening a window.
In IAML revisions 436 and 437, I implement a dynamic template in GMF that adds a breadcrumb-style way of visualising the current path to the root.
You can even use automated tests to verify the breadcrumb generation.