[Development]: Custom line algorithm stops touchpad from scrolling down in visual mark mode

[OmegaLambda1998]

When using force_custom_line_algorithm 1, visual marks can't scroll down via the touchpad. move_visual_mark_[up|down] commands still work fine, and scrolling up works as expected, but scrolling down simply displays a small red rectangle within the visual mark (see attached image)

Sioyek Version: 2.0.0.r947.g206177a-1

prefs_user.config

check_for_updates_on_startup 0
use_legacy_keybinds 0
background_color 0.97 0.97 0.97
dark_mode_background_color 0.0 0.0 0.0
dark_mode_contrast 0.8
text_highlight_color 1.0 1.0 0.0
visual_mark_color 0.0 0.0 0.0 0.1
search_highlight_color 0.0 1.0 0.0
link_highlight_color 0.0 0.0 1.0
synctex_highlight_color 1.0 0.0 1.0
use_ruler_to_highlight_synctex_line 1
dont_center_if_synctex_rect_is_visible 1
search_url_s https://scholar.google.com/scholar?q=
search_url_g https://www.google.com/search?q=
search_url_d https://www.duckduckgo.com/search?q=
middle_click_search_engine d
shift_middle_click_search_engine s
zoom_inc_factor 1.2
vertical_move_amount 1.0
horizontal_move_amount 1.0
move_screen_ratio 0.5
flat_toc 0
should_use_multiple_monitors 0
should_load_tutorial_when_no_other_file 0
should_launch_new_instance 0
should_launch_new_window 1
visual_mark_next_page_fraction 0
visual_mark_next_page_threshold 1
should_draw_unrendered_pages 0
rerender_overview 1
overview_size 0.8 0.5
overview_offset 0.0 -0.5
default_dark_mode 0
sort_bookmarks_by_location 1
startup_commands toggle_horizontal_scroll_lock;toggle_custom_color;toggle_visual_scroll;toggle_highligt;toggle_smooth_scroll_mode
custom_background_color 0.180 0.204 0.251
custom_text_color 0.847 0.871 0.914
wheel_zoom_on_cursor 1
fit_to_page_width_ratio 0.75
collapsed_toc 1
ruler_mode 1
ruler_display_mode slit
ruler_padding 1.0
ruler_x_padding 5.0
force_custom_line_algorithm 1
create_table_of_contents_if_not_exists 1
max_created_toc_size 5000
should_warn_about_user_key_override 1
single_click_selects_words 1
show_doc_path 1
multiline_menus 1
prerender_next_page_presentation 1
case_sensitive_search 1
highlight_color_a 0.94 0.64 1.00
highlight_color_b 0.00 0.46 0.86
highlight_color_c 0.60 0.25 0.00
highlight_color_d 0.30 0.00 0.36
highlight_color_e 0.10 0.10 0.10
highlight_color_f 0.00 0.36 0.19
highlight_color_g 0.17 0.81 0.28
highlight_color_h 1.00 0.80 0.60
highlight_color_i 0.50 0.50 0.50
highlight_color_j 0.58 1.00 0.71
highlight_color_k 0.56 0.49 0.00
highlight_color_l 0.62 0.80 0.00
highlight_color_m 0.76 0.00 0.53
highlight_color_n 0.00 0.20 0.50
highlight_color_o 1.00 0.64 0.02
highlight_color_p 1.00 0.66 0.73
highlight_color_q 0.26 0.40 0.00
highlight_color_r 1.00 0.00 0.06
highlight_color_s 0.37 0.95 0.95
highlight_color_t 0.00 0.60 0.56
highlight_color_u 0.88 1.00 0.40
highlight_color_v 0.45 0.04 1.00
highlight_color_w 0.60 0.00 0.00
highlight_color_x 1.00 1.00 0.50
highlight_color_y 1.00 1.00 0.00
highlight_color_z 1.00 0.31 0.02

keys_user.config

goto_beginning gg
goto_beginning <C-<home>>
goto_end <end>
goto_end G
goto_page_with_page_number <home>
goto_left_smart ^
goto_right_smart $
goto_top_of_page;goto_right_smart zz
next_page <C-<pagedown>>
previous_page <C-<pageup>>
screen_down J
screen_up K
screen_down <pagedown>
screen_up <pageup>
next_chapter gc
prev_chapter gC
prev_state <backspace>
prev_state <C-<left>>
new_window <C-t>
close_window <C-d>
next_state <C-l>
next_state <C-h>
goto_toc t
zoom_in  +
fit_to_page_width =
zoom_out -
rotate_clockwise r
rotate_counterclockwise R
fit_to_page_width <f9>
fit_to_page_width_smart <f10>
open_document <C-S-o>
open_document_embedded <C-o>
open_document_embedded_from_current_path o
open_prev_doc O
enter_visual_mark_mode V
move_visual_mark_up k
move_visual_mark_down j
move_visual_mark_up <up>
move_visual_mark_down <down>
search <C-f>
search /
chapter_search c<C-f>
chapter_search c/
next_item n
previous_item N
add_bookmark b
delete_bookmark db
goto_bookmark gb
goto_bookmark_g gB
add_highlight h
add_annot_to_highlight ah
goto_highlight gh
goto_highlight_g gH
delete_highlight dh
goto_next_highlight gnh
goto_prev_highlight gNh
set_mark m
goto_mark `
portal p
delete_portal dp
goto_portal gp
goto_portal <tab>
edit_portal P
edit_portal <S-<tab>>
toggle_window_configuration <f12>
copy y
toggle_fullscreen <f11>
toggle_highlight <f1>
command :
external_search s
toggle_dark_mode <f8>
toggle_synctex <f4>
synctex_under_cursor gf
toggle_mouse_drag_mode <f6>
toggle_visual_scroll <f7>
overview_definition l
goto_definition <C-]>
portal_to_definition ]
toggle_presentation_mode <f5>
noop q
open_link f
overview_link F
keyboard_select v

Example Image

When trying to scroll down with the touchpad, I get the following little red rectangle:

pressing j (mapped to move_visual_mark_down) works just fine.

[ahrm]

Does the issue happen with all documents and all zoom levels? What happens if you zoom out such that the documents fills only half of the screen?