SUMMARY If desktop-grid KWin-effect is activated its impossible to make screenshot with Spectacle STEPS TO REPRODUCE 1. Activate desktop-grid KWin-effect ("meta+G" default shortcut in my case) 2. Try to make a screenshot of a rectangular areas with Spectacle via shortcut ("PrintScreen" custom shortcut in my case) 3. observe OBSERVED RESULT nothing happens EXPECTED RESULT Rectangular area screenshot UI pops off and i can make a screenshot. SOFTWARE/OS VERSIONS Operating System: KDE neon 6.3 KDE Plasma Version: 6.3.5 KDE Frameworks Version: 6.14.0 Qt Version: 6.9.0 Kernel Version: 6.11.0-25-generic (64-bit) Graphics Platform: X11 Processors: 28 × Intel® Xeon® CPU E5-2690 v4 @ 2.60GHz Memory: 62.6 Gib of RAM Graphics Processor: AMD Radeon RX 550 / 550 Series ADDITIONAL INFORMATION This bug make reporting bugs in desktop-grid KWin-effect harder, because i cant easily make an image-proof of bug in this effect. There is no known sane way to make proper screenshot in desktop-grid view AFAIK.
I'm afraid this is an X11-specific limitation that cannot be fixed. It can however be worked around if you use the timer functionality in Spectacle to take the screenshot before activating Overview. On Wayland, it works as you expect.