Change Details

Create a new custom workbench editor with render windows that can be dynamically added and removed.

Create a basic custom workbench editor with multiple render windows that can be dynamically added and removed. This is the basis to further work on the "single render window" issues mentioned in T23763

Create a newbasic custom workbench editor with multiple render windows that can be dynamically added and removed. This is the basis to further work on the "single render window" issues mentioned in T23763