I want to suggest using [the pointer style of using .ui-files](https://doc.qt.io/qt-5/designer-using-a-ui-file.html#using-a-pointer-member-variable), which works by owning a pointer to the ui, instead of our multiple inheritance approach currently taken. This has the advantage that we could forward declare the ui-pointer in the header file. So if I change e.g. control.ui, **only** control.cpp gets recompiled, instead of everything depending on it (which currently is roundabout anything). Also (just an idea), the ui-Pointer could be injected, which means we could see the ui-file as View in Model-View-Controller and mock it to test the Controller.