Re: Pasting X selection fails

[Richard Stallman]

    Sometimes when I select a piece of text in another program (xterm or tkman
    or mozilla are examples, but it seems it can happen with any program) I am
    unable to paste the selection into emacs.  Instead, doing the "yank"
    command in emacs always pastes emacs' last "kill".  When I do
    "Alt-: (x-get-selection-internal 'PRIMARY 'STRING)" the result is also
    emacs' last kill, even though I just selected something in xterm a second
    before that.

Can you provide a test case for reproducing this?  Alternatively, can
you debug what happens inside Fx_get_selection_internal in the C code?
What Xlib calls does it do, and what answers do they get?