kcms/rules: add warning for low opacity
Once upon a time, in a moment of acute stupidity, I accidentally created a window rule making all windows completely transparent. I meant to go for 0% transparency when really the slider said 0% opacity. And once you've made the very window to change this setting invisible, the only way to fix that mistake is to log into a TTY or different DE and find the config file to edit manually. Since I've since seen several KRedditors fall into the same trap: Show a warning when active or inactive opacity is set to ~~<= 15%~~ < 25%. ![warning](/uploads/0b1178bf5782bff3b4293a0031bb4fca/warning.png)
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