MATRIX_ROW_GLYPH_START 5277 src/dispnew.c        obody = MATRIX_ROW_GLYPH_START (current_matrix, vpos);
MATRIX_ROW_GLYPH_START 18458 src/xdisp.c    	= MATRIX_ROW_GLYPH_START (matrix, w->cursor.vpos) + w->cursor.hpos;
MATRIX_ROW_GLYPH_START 35703 src/xdisp.c    	      && glyph == MATRIX_ROW_GLYPH_START (w->current_matrix, vpos)