Remove unused function nodeFullyUnselected from `ApplyStyleCommand.…

…cpp|h`

https://bugs.webkit.org/show_bug.cgi?id=267047

Reviewed by Ryosuke Niwa.

This PR is to delete unused function `nodeFullyUnselected` from ApplyStyleCommand.cpp|h.

* Source/WebCore/editing/ApplyStyleCommand.cpp:
(ApplyStyleCommand::nodeFullyUnselected): Deleted
* Source/WebCore/editing/ApplyStyleCommand.h: Delete function definition

Canonical link: https://commits.webkit.org/272623@main

Source/WebCore/editing/ApplyStyleCommand.cpp

@@ -1180,13 +1180,6 @@ bool ApplyStyleCommand::nodeFullySelected(Element& element, const Position& star
     return firstPositionInOrBeforeNode(&element) >= start && lastPositionInOrAfterNode(&element).upstream() <= end;
 }
 
-bool ApplyStyleCommand::nodeFullyUnselected(Element& element, const Position& start, const Position& end) const
-{
-    // The tree may have changed and Position::upstream() relies on an up-to-date layout.
-    element.protectedDocument()->updateLayoutIgnorePendingStylesheets();
-    return lastPositionInOrAfterNode(&element).upstream() < start || firstPositionInOrBeforeNode(&element) > end;
-}
-
 void ApplyStyleCommand::splitTextAtStart(const Position& start, const Position& end)
 {
     ASSERT(is<Text>(start.containerNode()));

Source/WebCore/editing/ApplyStyleCommand.h

@@ -87,7 +87,6 @@ class ApplyStyleCommand : public CompositeEditCommand {
     void pushDownInlineStyleAroundNode(EditingStyle&, Node*);
     void removeInlineStyle(EditingStyle&, const Position& start, const Position& end);
     bool nodeFullySelected(Element&, const Position& start, const Position& end) const;
-    bool nodeFullyUnselected(Element&, const Position& start, const Position& end) const;
 
     // style-application helpers
     void applyBlockStyle(EditingStyle&);