Save value of x_catch_errors and pass to x_uncatch_errors. (x_catch_errors): Use specpdl so can be nested. Use a Lisp string to as the buffer for the X message. (x_uncatch_errors, x_had_errors_p, x_check_errors): Related changes. (x_catch_errors_unwind): New function. (x_error_quitter): Call x_error_catcher if appropriate. (x_error_message_string): New variable. (syms_of_xterm): Defvar it. (x_caught_error_message): Variable deleted. (X_ERROR_MESSAGE_SIZE): Renamed from X_CAUGHT_ERROR_MESSAGE_SIZE. (x_error_handler): New function, calls x_error_quitter or ..._checker. (x_initialize): Use x_error_handler as error handler for X.
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