When I use my Debian vim that is not integrated with Gnome (vim --version | grep clip # shows no clipboard support), I can copy to the clipboard after holding the Shift key and selecting the text with the mouse, just like with any other curses program. As I figured from a comment by @Conner, it's the terminal (gnome-terminal in my case) that turns off its mouse event reporting when it senses my Shift press. I guess curses-based programs can receive mouse events after sending a certain Escape sequence to the terminal.
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