In presentation settings, Constrain Proportions does not always keep the aspect ratio

App version: Qt 3D Studio 2.2 BETA2

Test steps:
1. Go to presentation settings
2. Set width x height 1024x768
3. Check "Constrain Proportions"
4. Set width to 2048
-> The aspect ratio is not kept and width x height 2048x2048 is shown.

When aspect ratio is 2:1 (e.g. 1800x900 -> 1500x750) the constrain proportions works correctly.