Be more systematic about user-interface timestamps.
Before, the code sometimes used 'Time', sometimes 'unsigned long', and sometimes 'EMACS_UINT', to represent these timestamps. This change causes it to use 'Time' uniformly, as that's what X uses. This makes the code easier to follow, and makes it easier to catch integer overflow bugs such as Bug#8664. * frame.c (Fmouse_position, Fmouse_pixel_position): Use Time, not unsigned long, for user-interface timestamps. * keyboard.c (last_event_timestamp, kbd_buffer_get_event): Likewise. (button_down_time, make_lispy_position, make_lispy_movement): Likewise. * keyboard.h (last_event_timestamp): Likewise. * menu.c (Fx_popup_menu) [!HAVE_X_WINDOWS]: Likewise. * menu.h (xmenu_show): Likewise. * term.c (term_mouse_position): Likewise. * termhooks.h (struct input_event.timestamp): Likewise. (struct terminal.mouse_position_hook): Likewise. * xmenu.c (create_and_show_popup_menu, xmenu_show): Likewise. * xterm.c (XTmouse_position, x_scroll_bar_report_motion): Likewise. * systime.h (Time): New decl. Pull it in from <X11/X.h> if HAVE_X_WINDOWS, otherwise define it as unsigned long, which is what it was before. * menu.h, termhooks.h: Include "systime.h", for Time.
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