LibWeb: Request cursor change, leave tooltip area, and unhover link only when needed #1411
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Before, on *every* mouse-move event, `page_did_request_cursor_change()`
virtual function would get called, requesting to change cursor to the
event's mouse position's cursor.
Now, the page keeps track of the last cursor change that was requested
("page's current cursor") and only requests cursor change again if and
only if the current cursor is not already the one that is required.
Before, on a mouse-move event, if the hovered html element did not have a tooltip or it was not a link, `page_did_leave_tooltip_area()` and `page_did_unhover_link()` virtual functions would get called. Now, the page remembers if it is in a tooltip area or hovering a link and only informs of leaving or unhovering only if it was.
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Previously: SerenityOS/serenity#24039