Bug #4574. Common code for file/font dialog. Handle timers with glib-timers.
* keyboard.h: Declare timer_check. * keyboard.c (timer_check_2): New function that does what the old timer_check did. (timer_check): Call timer_check_2 until -1 or a non-zero time is returned, i.e. don't return -1 with timers pending. * process.c: Remove extern declaration of timer_check. * xmenu.c (x_menu_wait_for_event): Remove code that did a timeout even if timer_check returned -1. * gtkutil.c (xg_dialog_response_cb): data is now a struct xg_dialog_data (pop_down_dialog): Destroy widget (if any), cancel timer and unref the event loop. (xg_maybe_add_timer, xg_dialog_run): New functions (bug #4574). (xg_get_file_name, xg_get_font_name): Call xg_dialog_run (bug #4574). Destroy the dialog after xg_dialog_run.
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