How to reproduce:
- open Qt Creator (let's assume the welcome screen plugin is enabled)
- maximize it's main window
- disable the welcome screen plugin
- exit Qt Creator
- open Qt Creator
- Qt Creator opening in maximized state
- Qt Creator opening in weird state (see screen shot)
- The window size is much too small but the decoration buttons look like they are in maximized state.
This will now happen for every start of Qt Creator until I reactivate the Welcome Screen plugin.