Fix XTerm OSC 52 selection retrieval (bug#36879)
When asking XTerm for the selection via OSC 52, use ST as string terminator in the request to get ST as terminator in the reply, because BEL is messy to receive in many ways. * lisp/term/xterm.el (gui-backend-get-selection): Use ST as string terminator in request and reply. Use a time-out when reading the reply.
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