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This introduces the predicate frame-initial-p, which uses struct frame.output_method or struct terminal.type to detect initial_terminal without relying on its name (bug#80629). For some prior discussion, see: https://lists.gnu.org/r/emacs-devel/2019-12/msg00480.html https://lists.gnu.org/r/emacs-devel/2020-01/msg00120.html * doc/lispref/frames.texi (Frames): Document frame-initial-p. (Finding All Frames): Fix grammar. * etc/NEWS (Lisp Changes in Emacs 31.1): Announce frame-initial-p. * lisp/desktop.el (desktop--check-dont-save): * lisp/emacs-lisp/debug.el (debug): * lisp/frameset.el (frameset-restore): * lisp/menu-bar.el (menu-bar-update-buffers): * lisp/xt-mouse.el (turn-on-xterm-mouse-tracking-on-terminal): Use frame-initial-p instead of checking the "initial_terminal" name. * lisp/emacs-lisp/byte-opt.el: Mark frame-initial-p as error-free. * src/pgtkterm.c (pgtk_focus_changed): Use IS_DAEMON in place of Fdaemonp, thus also accepting a named daemon session. * src/terminal.c (decode_tty_terminal): Clarify commentary. (Fframe_initial_p): New function. (syms_of_terminal): Expose it. (init_initial_terminal): Update commentary now that menu-bar-update-buffers uses frame-initial-p (bug#53740). * test/lisp/xt-mouse-tests.el (with-xterm-mouse-mode): Simulate the lack of an initial terminal by overriding frame-initial-p now that turn-on-xterm-mouse-tracking-on-terminal uses it. * test/src/terminal-tests.el: New file.
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