typedef enum {
M_FORMAT_FORCESUBJ = (1 << 0), /* print the subject even if unchanged */
M_FORMAT_TREE = (1 << 1), /* draw the thread tree */
typedef enum {
M_FORMAT_FORCESUBJ = (1 << 0), /* print the subject even if unchanged */
M_FORMAT_TREE = (1 << 1), /* draw the thread tree */