redisplay w/o minibuffer broken

Version: 21.4 Window system: X Adding { int ph; char_to_pixel_size (f, f->width, f->height, NULL, &ph); assert (f->pixheight >= ph); /* have enough space for all chars */ } after resetting `f->size_slipped' in `redisplay_frame' shows that ill-formed frames really get into `redisplay_frame'. They have `pixheight' and `height' inconsistent and require size adjusting, but `size_slipped' is not set. Setting `f->size_slipped' in them by debugger make them look normally. The trouble is that when debugger printing between creating frame and redisplaying it is on, obtaining such a frames can not be reproduced. What functions are intended to change frame sizes and set `f->size_slipped'? In particular, where must such a setting occur during `Fmake_frame' when frame height property is specified? XEmacs experts?