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LibWeb: Add "position: sticky" support

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Sticky positioning is implemented by modifying the algorithm for
assigning and refreshing scroll frames. Now, elements with
"position: sticky" are assigned their own scroll frame, and their
position is refreshed independently from regular scroll boxes.
Refreshing the scroll offsets for sticky boxes does not require display
list invalidation.

A separate hash map is used for the scroll frames of sticky boxes. This
is necessary because a single paintable box can have two scroll frames
if it 1) has "position: sticky" and 2) contains scrollable overflow.
This commit is contained in:
Aliaksandr Kalenik 2024-08-24 19:20:31 +02:00 • committed by Alexander Kalenik
commit 30b636e90b
Notes: github-actions[bot] 2024-08-30 17:03:56 +00:00
20 changed files with 705 additions and 2 deletions
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1
Userland/Libraries/LibWeb/Layout/Node.h
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@ -122,6 +122,7 @@ public:
bool is_positioned() const;
bool is_absolutely_positioned() const;
bool is_fixed_position() const;
bool is_sticky_position() const;
bool is_flex_item() const { return m_is_flex_item; }
void set_flex_item(bool b) { m_is_flex_item = b; }