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LibGUI: Add is_toggled getter for TreeView
This has safer fallbacks than toggle_index, because we want to be able to call it on indices that don't have children.
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@ -21,6 +21,7 @@ public:
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virtual int item_count() const override;
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virtual void toggle_index(ModelIndex const&) override;
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bool is_toggled(ModelIndex const& index);
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void expand_tree(ModelIndex const& root = {});
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void collapse_tree(ModelIndex const& root = {});
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