Does anyone know why application windows unexpectedly minimize in KDE when typing on the keyboard? I'm using Linux Mint 13 32-bit on a Dell Precision M4600 laptop. It looks like the result of a desktop 'feature', because when it happens there are animation effects. I can get the application back by hitting ESC or clicking on the minimized form of the window I was using. But it interrupts my typing causing errors in the text, so it's pretty annoying and so far I haven't been able to find an option to turn it off. As I said, it happens when I'm typing on the keyboard, but I haven't been able to spot a particular key sequence that sets it off. System details follow.
KDE SC Version 4.8.5
CPU Intel(R) Core(TM) i7-2760QM @ 2.40GHz
Physical memory: 6 GiB
Total swap memory: 7.63 GiB
Graphics: AMD Whistler XT [AMD Radeon HD 6700M Series]