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substitute_start

pango-view Default [C/C++ Application]	
	pango-view [80235] [cores: 0]	
		Thread #1 [pango-view] 80235 [core: 0] (Suspended : Step)	
			substitute_start() at hb-ot-layout-gsub-table.hh:1,290 0x7ffff5d2f326	
			hb_ot_layout_substitute_start() at hb-ot-layout.cc:755 0x7ffff5d2f326	
			hb_ot_substitute_complex() at hb-ot-shape.cc:580 0x7ffff5d45c92	
			hb_ot_substitute() at hb-ot-shape.cc:596 0x7ffff5d45c92	
			hb_ot_shape_internal() at hb-ot-shape.cc:795 0x7ffff5d45c92	
			_hb_ot_shape() at hb-ot-shape.cc:816 0x7ffff5d45c92	
			hb_shape_plan_execute() at hb-shaper-list.hh:43 0x7ffff5d278b7	
			hb_shape_full() at hb-shape.cc:375 0x7ffff5d26f2e	
			hb_shape() at hb-shape.cc:405 0x7ffff5d26f68	
			basic_engine_shape() at basic-fc.c:398 0x7ffff39b7de4	
			pango_shape_full() at shape.c:116 0x7ffff7bb8f7b	
			shape_run() at pango-layout.c:3,293 0x7ffff7b9c39c	
			process_item() at pango-layout.c:3,406 0x7ffff7b9c68d	
			process_line() at pango-layout.c:3,704 0x7ffff7baf78a	
			pango_layout_check_lines() at pango-layout.c:4,027 0x7ffff7baf78a	
			pango_layout_get_extents_internal() at pango-layout.c:2,587 0x7ffff7bb1208	
			pango_layout_get_pixel_extents() at pango-layout.c:2,808 0x7ffff7bb1636	
			output_body() at viewer-render.c:214 0x404665	
			do_output() at viewer-render.c:312 0x405156	
			pangocairo_view_render() at viewer-pangocairo.c:338 0x406ea7	
			main() at viewer-main.c:65 0x403e4f	
	gdb (7.7.1)