The Qt Design Studio 4.0.1 release contains bug fixes and new features.

The most important changes are listed in this document.
For a complete lists of changes, see release reports for Qt Design Studio
4.0.1: https://bugreports.qt.io/projects/QDS/versions/20844

General
  * Fixed that QDS always opens the design mode (QDS-9460)
  * Improved speed of copy and pase (QDS-9441)
  * Improved speed of undo (QDS-9440)
  * Fixed crashes (QDS-9438, QDS-9439)
  * Fixed invalid path leading to hanging QDS (QDS-9437)
