Support X clipboard managers.
* lisp/select.el (xselect-convert-to-targets): Add MULTIPLE target to list. (xselect-convert-to-save-targets): New function. * src/xselect.c: Support for clipboard managers. (Vselection_alist): Move to termhooks.h as terminal-local var. (LOCAL_SELECTION): New macro. (x_atom_to_symbol): Handle x_display_info_for_display fail case. (symbol_to_x_atom): Remove gratuitous arg. (x_handle_selection_request, lisp_data_to_selection_data) (x_get_foreign_selection, Fx_register_dnd_atom): Callers changed. (x_own_selection, x_get_local_selection, x_convert_selection): New arg, specifying work frame. Use terminal-local Vselection_alist. (some_frame_on_display): Delete unused function. (Fx_own_selection_internal, Fx_get_selection_internal) (Fx_disown_selection_internal, Fx_selection_owner_p) (Fx_selection_exists_p): New optional frame arg. (frame_for_x_selection, Fx_clipboard_manager_save): New functions. (x_handle_selection_clear): Don't treat other terminals with the same keyboard specially. Use the terminal-local Vselection_alist. (x_clear_frame_selections): Use Frun_hook_with_args. * src/termhooks.h (Vselection_alist): Make it terminal-local. * src/terminal.c (create_terminal): Initialize it. * src/xterm.c (x_term_init): Intern ATOM and CLIPBOARD_MANAGER atoms. * src/xterm.h: Add support for those atoms.
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