Add QScrollArea to QDialog

[Rachol]

Ok, now it is easy

There are couple of ways to solve your problem.

1. The easiest way would be to place a layout inside your MixerStrip class and then place all the widgets inside the layout instead of hardcoding all coordinates.
2. Re-implement minimumSizeHint and maximumSizeHint. You could return the same value that you return in your sizeHint implementation.