Hi, nice app, but in Linux (LM20 based on Ubuntu 20.04), cut or copy an are would not work.
Error
$ lazpaint --sync
WARNING: TGtk2WidgetSet.InvalidateRect refused invalidating during paint message: TBGRAVirtualScreen
The program 'lazpaint' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
(Details: serial 200473 error_code 3 request_code 18 minor_code 0)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Steps to reproduce:
1. open an image
2. select area tool
3. make an selection in the image
4. press control-X or control-C
5. program terminates, error in CLI is present