SUMMARY Screenshot is impossible when context menu is displayed STEPS TO REPRODUCE 1. right-click on plasma desktop or in Dolphin 2. tap screenshot key in keyboard OBSERVED RESULT nothing EXPECTED RESULT screenshot is taken with the menu displayed SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Neon 5.23.5 (available in About System) KDE Plasma Version: 5.23.5 KDE Frameworks Version: 5.90 Qt Version: 5.15.3 ADDITIONAL INFORMATION
This is an issue in X11 itself; X11 grabs all keyboard input when a menu is open, so the global shortcuts for opening spectacle do not work. It already works properly on Wayland. On X11, you can use Spectacle's timer feature to do it. Activate the timer, take the screenshot, then open the menu before the timer runs out.