Describe the bug
The frozen preview of the screen is scaled, if the desktop dimensions have changed since starting ksnip. If you select the "right" area, it will capture it correctly, but you have to guess as you won't snip what it looks like you will snip

To Reproduce
Steps to reproduce the behavior:

1. Start ksnip, take an area screenshot, all is OK
2. Change desktop size, eg by connecting a monitor
3. Take an area screenshot.
4. The preview is scaled

Expected behavior
The frozen preview should not be scaled.

Desktop (please complete the following information):

• OS: Linux
• Distribution in case of Linux: Ubuntu 21.10
• Window System: X11/KDE
• ksnip version: 1.9.2
• How did you install ksnip: .deb package

Additional context
I am pretty sure this issue appeared after upgrading from 1.9.1 to 1.9.2