If I select some text and then copy the
selected text using Ctrl-c and paste the
the copied text into another document without prior deselecting the copied text in the original document, the Ctrl-c command acts like a Ctrl-x command.
In a KDE (and Gnome I presume, because this behaviour existed allready in CDE on HP-UX and Solaris) one slelects a piece of text by left-click-down at one end, move to the other end and release left-button. Then this text is “under the mouse”. Move the mouse to another place (can be in another window) andd to paste a copy, only click the middle-button. No need for keyboard access at all (even not two hands because of the Cntrl-key).
Yes, I know…however this does not change the fact , that the text disappears from the original document.
If you copy in the same document this issue does not manifest itself, because the originally selected text is automatically deselected if you move the cursor to another position and do the insert , be it via middle button click or ctrl-v