(message_truncate_lines, Qmessage_truncate_lines): New
variables. (ensure_echo_area_buffers): Initialize echo buffer's truncate lines setting to nil. (with_echo_area_buffer): Don't set the echo buffer's truncate lines setting here. (set_message_1): Set it here, instead, based on the value of message_truncate_lines. (resize_mini_window): Handle case that lines are truncated. (syms_of_xdisp): Initialize Qmessage_truncate_lines. DEFVAR_BOOL message-truncate-lines.
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