Region picked from 4K screen is wrong, all corner coordinates are doubled - out of screen dimensions causes zero width / height error

[hsandt]

Brief summary of issue

When capturing a region screenshot from a 4K screen, the rectangle corner coordinates are all incorrectly doubled, leading to a bigger rectangle and on the wrong position.

Below, a drawing of the original intended capture in green, and the bigger red rectangle showing the actual capture, offset toward the bottom-right.

If the red rectangle hits the bottom-right limit then you even get an error:

Failed
Error: selection widht or height is zero, please retry!

Steps to reproduce the issue

1. Use single 4K monitor
2. Shutter: Rectangular selection capture
3. Select a region in the top-left quarter => offset and bigger capture
4. Select a region in the bottom-right quarter => "zero" error

Error output

On step 4 only:

Failed
Error: selection widht or height is zero, please retry!

Extra information, such as Shutter version, display server in use (Xorg or Wayland), operating system and ideas for how to solve:

0.99.5 Rev.1783 (custom repo copy, master branch, 2024-04-02 23:19, commit bce8db8)

Linux Ubuntu 22.04, Xorg

[hsandt]

For multi-monitor: see this issue where the offset stays the same but wrong monitor is used: #414

It's also possible that doubling coordinates makes the selection move across one monitor to the other!

[hsandt]

Note: in comparison, Ubuntu Unity desktop native screenshot app fails on full screenshot with the reverse issue, it captures only the top-left quarter of the screen, but its Window and Rectangle selection work fine.