Lately having dockable widget windows has become quite popular for apps with property tabs etc so I was thinking a Docking widget might be cool to have. Since we have been discussing decreasing the number of unique widgets I figured it could probably be done using a style template instead. Using the drag behavior, snapping, and a grid should let you make a window with a header bar that has all the functionality of a dockable layout.
I don’t know how you would make a drag-able resize behavior without a lot of extra code though. If there is enough interest in making resizeable windows it might be useful to add that behavior into LVGL.