LibGUI: Splitter should only override cursor if within grabbable area

Fixes #3284

Libraries/LibGUI/Splitter.cpp

@@ -58,15 +58,25 @@ void Splitter::resize_event(ResizeEvent& event)
     m_grabbable_rect = {};
 }
 
-void Splitter::enter_event(Core::Event&)
+void Splitter::override_cursor(bool do_override)
 {
-    window()->set_override_cursor(m_orientation == Orientation::Horizontal ? StandardCursor::ResizeColumn : StandardCursor::ResizeRow);
+    if (do_override) {
+        if (!m_overriding_cursor) {
+            window()->set_override_cursor(m_orientation == Orientation::Horizontal ? StandardCursor::ResizeColumn : StandardCursor::ResizeRow);
+            m_overriding_cursor = true;
+        }
+    } else {
+        if (m_overriding_cursor) {
+            window()->set_override_cursor(StandardCursor::None);
+            m_overriding_cursor = false;
+        }
+    }
 }
 
 void Splitter::leave_event(Core::Event&)
 {
     if (!m_resizing)
-        window()->set_override_cursor(StandardCursor::None);
+        override_cursor(false);
     if (!m_grabbable_rect.is_empty()) {
         m_grabbable_rect = {};
         update();
@@ -134,9 +144,12 @@ void Splitter::mousemove_event(MouseEvent& event)
     if (!m_resizing) {
         Widget* first { nullptr };
         Widget* second { nullptr };
-        if (!get_resize_candidates_at(event.position(), first, second))
+        if (!get_resize_candidates_at(event.position(), first, second)) {
+            override_cursor(false);
             return;
+        }
         recompute_grabbable_rect(*first, *second);
+        override_cursor(m_grabbable_rect.contains(event.position()));
         return;
     }
     auto delta = event.position() - m_resize_origin;

Libraries/LibGUI/Splitter.h

@@ -44,7 +44,6 @@ protected:
     virtual void mousedown_event(MouseEvent&) override;
     virtual void mousemove_event(MouseEvent&) override;
     virtual void mouseup_event(MouseEvent&) override;
-    virtual void enter_event(Core::Event&) override;
     virtual void leave_event(Core::Event&) override;
 
     virtual void did_layout() override;
@@ -52,9 +51,11 @@ protected:
 private:
     void recompute_grabbable_rect(const Widget&, const Widget&);
     bool get_resize_candidates_at(const Gfx::IntPoint&, Widget*&, Widget*&);
+    void override_cursor(bool do_override);
 
     Gfx::Orientation m_orientation;
     bool m_resizing { false };
+    bool m_overriding_cursor { false };
     Gfx::IntPoint m_resize_origin;
     WeakPtr<Widget> m_first_resizee;
     WeakPtr<Widget> m_second_resizee;