Implemented full screen feature

src/files.h

@@ -156,7 +156,8 @@ R"RAW(
         "close_tab": "<primary>w",
         "window_toggle_split": "",
         "window_toggle_tabs": "",
-        "window_clear_terminal": ""
+        "window_clear_terminal": "",
+        "full_screen": "F11"
     },
     "project": {
         "default_build_path_comment": "Use <project_directory_name> to insert the project top level directory name",

src/menu.cc

@@ -454,6 +454,12 @@ const Glib::ustring menu_xml= R"RAW(<interface>
           <attribute name='action'>app.window_clear_terminal</attribute>
         </item>
       </section>
+      <section>
+        <item>
+          <attribute name='label' translatable='yes'>_Full _Screen</attribute>
+          <attribute name='action'>app.full_screen</attribute>
+        </item>
+      </section>
     </submenu>
   </menu>
 </interface>

src/window.cc

@@ -1184,6 +1184,15 @@ void Window::set_menu_actions() {
   menu.add_action("window_clear_terminal", [this] {
     Terminal::get().clear();
   });
+  menu.add_action("full_screen", [this] {
+    if(!is_full_screen){
+      Window::get().fullscreen();
+      is_full_screen = true;
+    } else {
+      Window::get().unfullscreen();
+      is_full_screen = false;
+    }
+  });
   menu.add_action("window_toggle_tabs", [this] {
     Notebook::get().toggle_tabs();
   });

src/window.h

@@ -35,6 +35,7 @@ private:
   bool case_sensitive_search=true;
   bool regex_search=false;
   bool search_entry_shown=false;
+  bool is_full_screen=false;
 };
 
 #endif  // JUCI_WINDOW_H