More syntax table weirdness
Not sure if this is new to 21.4. Put:
printf ("redisplay_output_pixmap(normalized) \
[%dx%d＠%d+%d] in [%dx%d＠%d+%d]",
db->width, db->height, db->xpos, db->ypos,
dga->width, dga->height, dga->xoffset, dga->yoffset);
In a C buffer, go to the 3rd line type a space and then tab to reindent.
Although the text is indented properly it turns into the string color
(assuming you have got font-lock turned on).
andy