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LibWeb: Save ScrollState snapshot in DisplayList to avoid race condition
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Browse source 
With this change we save a copy of of scroll state at the time of
recording a display list, instead of actual ScrollState pointer that
could be modifed by the main thread while display list is beings
rasterized on the rendering thread, which leads to a frame painted with
inconsistent scroll state.

Fixes https://github.com/LadybirdBrowser/ladybird/issues/4288
This commit is contained in:
Aliaksandr Kalenik 2025-04-11 20:00:56 +02:00 • committed by Alexander Kalenik
commit 6507d23e29
Notes: github-actions[bot] 2025-04-12 00:56:11 +00:00
18 changed files with 85 additions and 29 deletions
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Libraries/LibWeb/Painting/NavigableContainerViewportPaintable.cpp
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@ -60,7 +60,8 @@ void NavigableContainerViewportPaintable::paint(PaintContext& context, PaintPhas
paint_config.should_show_line_box_borders = context.should_show_line_box_borders();
paint_config.has_focus = context.has_focus();
auto display_list = const_cast<DOM::Document*>(hosted_document)->record_display_list(paint_config);
context.display_list_recorder().paint_nested_display_list(display_list, context.enclosing_device_rect(absolute_rect).to_type<int>());
auto scroll_state_snapshot = hosted_document->paintable()->scroll_state().snapshot();
context.display_list_recorder().paint_nested_display_list(display_list, move(scroll_state_snapshot), context.enclosing_device_rect(absolute_rect).to_type<int>());
context.display_list_recorder().restore();