Add hflow.

ftxui/include/ftxui/dom/elements.hpp

@@ -33,9 +33,10 @@ Element bgcolor(Color, Element);
 
 // --- Layout ---
 // Horizontal, Vertical or stacked set of elements.
-Element vbox(Elements);
 Element hbox(Elements);
+Element vbox(Elements);
 Element dbox(Elements);
+Element hflow(Elements);
 
 // -- Flexibility ---
 // Define how to share the remaining space when not all of it is used inside a
@@ -73,6 +74,7 @@ Decorator operator|(Decorator, Decorator);
 TAKE_ANY_ARGS(vbox)
 TAKE_ANY_ARGS(hbox)
 TAKE_ANY_ARGS(dbox)
+TAKE_ANY_ARGS(hflow)
 
 };  // namespace ftxui
 

ftxui/include/ftxui/screen/screen.hpp

@@ -33,6 +33,7 @@ class Screen {
   // Constructor using the terminal.
   static Screen TerminalFullscreen();
   static Screen TerminalOutput(std::unique_ptr<Node>& element);
+  static Screen FitDocument(std::unique_ptr<Node>& element);
 
   // Node write into the screen using Screen::at.
   wchar_t& at(size_t x, size_t y);