Add support for italics (#1009)

Co-authored-by: Ken Reneris <ms/devops kreneris@microsoft.com>
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

examples/dom/CMakeLists.txt

@@ -29,6 +29,7 @@ example(style_dim)
 example(style_gallery)
 example(style_hyperlink)
 example(style_inverted)
+example(style_italic)
 example(style_strikethrough)
 example(style_underlined)
 example(style_underlined_double)

examples/dom/style_gallery.cpp

@@ -15,6 +15,7 @@ int main() {
     hbox({
       text("normal")                                    , text(" ") ,
       text("bold")               | bold                 , text(" ") ,
+      text("italic")             | italic               , text(" ") ,
       text("dim")                | dim                  , text(" ") ,
       text("inverted")           | inverted             , text(" ") ,
       text("underlined")         | underlined           , text(" ") ,

examples/dom/style_italic.cpp

@@ -0,0 +1,23 @@
+// Copyright 2025 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#include <ftxui/dom/elements.hpp>  // for text, operator|, inverted, Fit, hbox, Element
+#include <ftxui/screen/screen.hpp>  // for Full, Screen
+#include <memory>                   // for allocator
+
+#include "ftxui/dom/node.hpp"      // for Render
+#include "ftxui/screen/color.hpp"  // for ftxui
+
+int main() {
+  using namespace ftxui;
+  auto document = hbox({
+      text("This text is "),
+      text("italic") | italic,
+      text(". Do you like it?"),
+  });
+  auto screen = Screen::Create(Dimension::Full(), Dimension::Fit(document));
+  Render(screen, document);
+  screen.Print();
+
+  return 0;
+}