SUMMARY ‘If your keyboard has a “Calculator” button, pressing it will now open KCalc’ says the post on Plasma 5.26. Which means kcalc will spawn multiple times if you won't depress the button fast enough. STEPS TO REPRODUCE 1. Press "Calculator". 2. Hold a bit. 3. Release. OBSERVED RESULT Likely multiple calculators. EXPECTED RESULT Should be only one calculator. Either: a) only single kcalc window should be possible; b) autorepeat for that button should be disabled; c) kcalc should only be running on key release. TBH, this problem exist with any program that is run with a global hotkey, so maybe ‘c’ is better, but I'm unsure how it aligns with good UX.