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A button just like the show on all desktops, but for making the window stay on top.

Right click on window titlebar -> Configure Window Behavior... -> Windows -> Buttons -> add "Keep Above Others" to the titlebar preview.

I know, but that's a lot more difficult than just hitting a button if you use the function a lot. It could at least be made possible to turn on as a feature through the settings.

Huh? If you add it to the titlebar, it'll appear on all window decorations (similar to Close and Minimize).

Exactly, but to the left besides the "Show on all desktops button". But I get your point, maybe on a selected group of programs... so maybe it should be turned off as default, and made possible to turn on in the programs one would like

Sorry, but I don't understand what you mean (could be due to me being tired). If you add the button, you can move it wherever you want in the titlebar.

Haha, noo no What I mean is like this. For example working with two applications at the same time, and usually I'd like to make the one of them stay on top. Then it would be very handy to just click a button, rather than going through a whole lot of menues. The button should reside all the way to the left in the titlebar. But maybe it's only me who find the stay on top function so good that I would like to dedicate that much space for it...

Wow! It exist's alerady!? Alright then Haha