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Thanks for the response, Mathew!
Currently I am running Mate 1.16 on CentOS 7.7.1908 and I have had similar experience on Linux Mint 19 Mate, OpenSuse, various versions and desktops, and Ubuntu 18.04 running Gnome 3 but after experimenting a little I realise that I have to be more precise in my question.
The thing that does not work as I want unless I first paste in another window is if I use left double click for the copy part. In Geany this operation has the effect of also moving the insert point and middle mouse click does paste in that spot but it's
rather meaningless. If I left click where I want to paste the copy is gone unless I first paste in another window. If I use left click + drag for the copy part the insert point is not moved and middle mouse click pastes as expected. I just learned this but
doing the copy with left double click is so much easier so I am not in the habit of using left click + drag to copy a single word but if there is no way to tweak the Geany behaviour I guess I have to get used to it.
In a terminal window or a terminal editor left double click does not move the insert point and middle mouse paste works without any intermediate step. This is the behaviour I would like to see also in Geany.
Kind regards,
Gösta Ljungdahl