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SpaceAnalyzer: Fix the crash caused by using arrow keys
Previously, SpaceAnalyzer set focus on the selected BreadcrumbButton. Using arrow keys triggered the keydown_event of the AbstractButton, which later on caused a Function object to be deleted while it is still being used. This change sets the focus on TreeMapWidget and adds an event handler to TreeMapWidget for keydown events. Fixes #13254.
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@ -47,6 +47,7 @@ private:
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virtual void doubleclick_event(GUI::MouseEvent&) override;
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virtual void mousewheel_event(GUI::MouseEvent&) override;
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virtual void context_menu_event(GUI::ContextMenuEvent&) override;
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virtual void keydown_event(GUI::KeyEvent&) override;
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bool rect_can_contain_children(const Gfx::IntRect& rect) const;
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bool rect_can_contain_label(const Gfx::IntRect& rect) const;
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