Crash when closing windows
Most likely related to the switch to libhandy-1, possibly even a libhandy bug:
(gdb) bt
#0 0x0000ffffb925e624 in hdy_carousel_box_get_page_at_position (self=0xaaaae855bc20, position=0) at ../src/hdy-carousel-box.c:1745
#1 0x0000ffffb925e6d0 in hdy_carousel_box_get_current_page_index (self=0xaaaae855bc20) at ../src/hdy-carousel-box.c:1765
#2 0x0000ffffb925a208 in animation_stopped_cb (self=0xaaaae855bab0, box=<optimized out>) at ../src/hdy-carousel.c:205
#3 0x0000ffffb94e6c5c in () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#4 0x0000ffffb9503690 in g_signal_emit_valist () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#5 0x0000ffffb9503b98 in g_signal_emit () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#6 0x0000ffffb925e54c in animate_position (frame_clock=0xaaaae80795d0, self=0xaaaae855bc20) at ../src/hdy-carousel-box.c:327
#7 0x0000ffffb925e54c in animation_cb (widget=<optimized out>, frame_clock=0xaaaae80795d0, user_data=<optimized out>) at ../src/hdy-carousel-box.c:436
#8 0x0000ffffb9e280e0 in () at /lib/aarch64-linux-gnu/libgtk-3.so.0
#9 0x0000ffffb94e69f8 in g_closure_invoke () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#10 0x0000ffffb94fb2b8 in () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#11 0x0000ffffb950362c in g_signal_emit_valist () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#12 0x0000ffffb9503b98 in g_signal_emit () at /lib/aarch64-linux-gnu/libgobject-2.0.so.0
#13 0x0000ffffb99be8a8 in () at /lib/aarch64-linux-gnu/libgdk-3.so.0
#14 0x0000ffffb99a79b0 in () at /lib/aarch64-linux-gnu/libgdk-3.so.0
#15 0x0000ffffb93f30e4 in () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#16 0x0000ffffb93f251c in g_main_context_dispatch () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#17 0x0000ffffb93f28e8 in () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#18 0x0000ffffb93f2c80 in g_main_loop_run () at /lib/aarch64-linux-gnu/libglib-2.0.so.0
#19 0x0000ffffb9cdaa60 in gtk_main () at /lib/aarch64-linux-gnu/libgtk-3.so.0
#20 0x0000aaaabb3d2a1c in main (argc=<optimized out>, argv=<optimized out>) at ../src/main.c:96