Delete copy constructor and copy operator (#638)

Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ current (development)
 - Feature: Support `ResizableSplit` with customizable separator.
 - Breaking: MenuDirection enum is renamed Direction
 - Fix: Remove useless new line when using an alternative screen.
+- Breaking/Fix: Remove `ComponentBase` copy constructor/assignment.
 
 ### Dom
 - Feature: Add the dashed style for border and separator.

include/ftxui/component/component_base.hpp

@@ -29,6 +29,12 @@ class ComponentBase {
   // virtual Destructor.
   virtual ~ComponentBase();
 
+  ComponentBase() = default;
+
+  // A component is not copiable.
+  ComponentBase(const ComponentBase&) = delete;
+  void operator=(const ComponentBase&) = delete;
+
   // Component hierarchy:
   ComponentBase* Parent() const;
   Component& ChildAt(size_t i);