Some projects keep surprising me with their “solutions,” and this is one of those cases. A proposal under review by developers from GNOME and Mozilla could change how middle-mouse-button paste behaves on Linux and other Unix-like systems.
The discussions, visible in Mozilla’s Phabricator revision D277804 and a linked GNOME gsettings-desktop-schemas merge request, focus on disabling the traditional primary selection paste by default.
Mozilla proposes changing the default behavior of the Firefox browser on Unix builds so that pressing the middle mouse button no longer pastes text by default. The author of the revision frames the current behavior as a source of confusion and accidental pastes, especially when users press the middle button without expecting the clipboard contents to be inserted into text fields.
I find it very useful, and it conflicts with normal copy paste very rarely. There are two clipboards, one is filled with latest highlighted, and the other with latest Ctrl+C:ed. Middle click pastes from the first, Ctrl+V from the second. This makes you able to copy two things at once: ctrl+c something first, highlight something else second, paste in any order. The confusing thing when learing to use it for me was that since I need to highlight to ctrl+c, I will overwrite what is in the middle click clipboard, and it also means you cannot highlight something to replace it with whats in your middle click clipboard. It does however mean that most times you want to do a ctrl+c/ctrl+v both clipboards are in sync. Not sure why, but I often find myself having to copy/paste two things at once, and I use both buffers without thinking. Which makes it impossible to use macos.