Bug 496183

Summary: [multi-monitor] Spectacle preview has massive coordinate offset when entering capture rectangular mode
Product: [Applications] Spectacle Reporter: Andrea Ippolito <andrea.ippo>
Component: GeneralAssignee: Noah Davis <noahadvs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: filip.kendes1, kde
Priority: NOR    
Version First Reported In: 24.08.3   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: capturing the region you want requires a lot of luck now

Description Andrea Ippolito 2024-11-12 16:46:32 UTC 
Imagine this, you have a window open, e.g. firefox and want to capture a rectangular region from it, e.g. from coords 100,100 to 400,400, because that's where the content you're interested in appears on the screen.

You fire up Spectacle, start a rectangular region screen capture, and at that moment the entire window with the contents you wanted to capture SHIFTS by a considerable amount.

Mind you, this shift only happens in the "preview"/frame freeze created by spectacle for allowing you to draw your region. The window does not really move from a window manager perspective.

This means that:
- capturing the area you intended to becomes a guess work
- as soon as the selection is captured, what you see goes back to normal

This is a recent regression, but I don't know exactly since which version (I think it must've happened within the past month, not more).

I have a dual screen setup, will test if I can reproduce also with just the internal screen enabled.
Comment 1 Andrea Ippolito 2024-11-12 16:48:54 UTC 
Created attachment 175766 [details]
capturing the region you want requires a lot of luck now
Comment 2 Andrea Ippolito 2024-11-12 16:51:53 UTC 
FYI, the window you see in the preview mode which is "pushing in" from the right, is the OBS Studio window I had entirely on my other screen and that I was using to record the bug.

It seems like when entering "rectangular region" selection mode, the view gets offset/shifted by a certain amount

I also just confirmed that this doesn't happen when working with a single screen.
Comment 3 Filip 2024-11-12 18:07:52 UTC 

*** This bug has been marked as a duplicate of bug 496057 ***