hello there,
since recently I faced a new behavior: when I select text (in a text editor, in a browser, anywhere basically…) and click the scroll or middle button of my mouse, it pastes the content where my cursor is…
This happens without me making any copy operation. If I selected text anywhere and click the middle/scroll button, the selected text is pasted at cursor location…
any ideas what could cause this to happen ?
Welcome to Fedora @boopdadm
You might have to install gnome-tweaks and under Mouse & Touchpad >> first option Mouse Middle Click Paste to deactivate.
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thanks L.S. 
I saw that as well on other threads. I just did it, and indeed, it seems it fixes the middleclick paste in text editor for example.
I’ve seen as well here that there is a config in Firefox.
Now I am trying in Chromium, and middleclick is enabled too…
I have the impression this behavior is new, maybe I am mistaking, but it feels weird to have to deactivate it on the application level…
That is not a new behavior. This is a feature of X-windows from even before linux was created.
It is called “select buffer” and not the same as the “clipboard”. Try search for “x11 selection buffer” for more information.
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Many of us love this feature and use it all the time.
Indeed wayland was missing this and had to add it in after a lot of pressure from users used to this under X11.