To reproduce: While the application launcher or krunner is open, enter a Kwin keyboard shortcut (like super + left) and the window will be resized according to the shortcut. Since the window isn't resizable through handles I assume this is unintended behavior. Also, I know of no way to restore them to their normal sizes without something like logging out and back in. OBSERVED RESULT Focused windows are resized. EXPECTED RESULT These windows should not be resizable via keyboard shortcuts. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch on Linux 5.14.14 (available in About System) KDE Plasma Version: 5.23.2 KDE Frameworks Version: 5.87.0 Qt Version: 5.152. ADDITIONAL INFORMATION While this could be considered a feature, it should be more obvious to users and more "intentional". Right now it's much more likely to confuse people.
*** This bug has been marked as a duplicate of bug 416291 ***
*** This bug has been marked as a duplicate of bug 411462 ***