Dirk Engel

Thank you Ben and David for this contribution. The flexible boxes finally provide a way of real interactive GUI scalability. Found nothing comparable.

Unfortunately, still some bugs and missing features (in v1.8) for large GUI applicatons. E.g.
* for containers with 2 or more dividers, sliding one divider behind another one throws "Width and height must be > 0" in Container>Container.repositionChild at 340
* dividers often overlap borders of adjacent panels, looks very unprofessional (perhaps a rounding problem of pixel positions?)
* poor redrawing in case of many nested flexible boxes (one has to watch the controls getting resized back and forth several times until the final result)
* user-defined WindowButtonUpFcn is getting lost when a divider is moved while any figure mode is on (e.g. zoom). When turning off the mode, the WindowButtonUpFcn of the devider is restored instead of the user-defined callback function.
* nice to have: height and width limits and maybe other constraints for flexible containers. Perhaps one can adopt some ideas from another nice layout manager: GridBagLayout. Thanks to OOP I'm of course free to do this by subclassing, but maybe the feature finds its way into the uiextras toolbox.