version 16.12.3
It can be a duplicate. This issue happen when I click on "start rectangular region screenshot" or just later ??? Screen is dimmed, I can make rectangular selections using mouse but I cannot exit (return to spectable). alt-tab works to switch window. But I have to kill spectacle on text console to recover my Kde session. It happened several times, but I don't know how to reproduce it.
Does the return key work? If not, this might be a duplicate of https://bugs.kde.org/show_bug.cgi?id=374009
If you can provide the information requested in comment #2, please add it.
No response, assume it is indeed a duplicate. *** This bug has been marked as a duplicate of bug 374009 ***
It's not a duplicate, because getting Spectacle stuck in fullscreen (but still working) is different from hanging or even crashing the whole system due to other (likely GPU) issues. The other bugs says "I can't alt-tab to another window", while here the reporter mentions "alt-tab works to switch window". STR for me on Qt 5.10 / Plasma 5.12: - Start "spectacle", set combobox to "Rectangular Region", Ctrl + N - Shift + Print to invoke global shortcut - Esc to show we are stuck - Ctrl + Cto kill spectacle Interestingly, on a Qt 5.11 / Plasma 5.13 system I cannot reproduce. Might also be related / similar to some issues Yakuake causes wrt. freezing input handling, see Bug 378718.
*** Bug 379145 has been marked as a duplicate of this bug. ***
After further investigation of Bug 374009, this is indeed a duplicate of it. *** This bug has been marked as a duplicate of bug 374009 ***