Enable dead key diacritic indicator

I recently tried Debian Buster with KDE Plasma 5 and I noticed a cool feature which I'd like to have on my current distribution. I use a US international keyboard with dead keys layout and, with Debian, as soon as I press a dead key (such as ` or '): > the diacritic is displayed, along with an indication that the system is waiting for another keystroke to complete the typing sequence. (to quote Wikipedia's Dead key page ) I took a screen recording to let you better understand what I'm talking about: Do you know if this is an exclusively Debian feature? Is there any way I can have it on any other GNU+Linux distribution?