How to copy and paste inside Vim using mouse

Sometimes copy and paste inside Vim using mouse over remote connection does not work as expected.

It is a rare situation, but it can happen to you at one time or another.

Vim

The solution is to use mouse option.

'mouse'                 string  (default "", "a" for GUI, MS-DOS and Win32,
                                                 set to "a" in defaults.vim)
                        global
                        {not in Vi}
        Enable the use of the mouse.  Only works for certain terminals
        (xterm, MS-DOS, Win32 win32-mouse, QNX pterm, *BSD console with
        sysmouse and Linux console with gpm).  For using the mouse in the
        GUI, see gui-mouse.
        The mouse can be enabled for different modes:
                n       Normal mode and Terminal modes
                v       Visual mode
                i       Insert mode
                c       Command-line mode
                h       all previous modes when editing a help file
                a       all previous modes
                r       for hit-enter and more-prompt prompt
        Normally you would enable the mouse in all four modes with:
                :set mouse=a
        When the mouse is not enabled, the GUI will still use the mouse for
        modeless selection.  This doesn't move the text cursor.
        See mouse-using.  Also see 'clipboard'.
        Note: When enabling the mouse in a terminal, copy/paste will use the
        "* register if there is access to an X-server.  The xterm handling of
        the mouse buttons can still be used by keeping the shift key pressed.
        Also see the 'clipboard' option.
vim help

Inspect mouse option.

:set mouse?
  mouse=

Set mouse option to r or v.

:set mouse=r

Enjoy!