update viewport level, make managed

src/app/browser/main/tab/page/content/text/gemini.cpp

@@ -4,25 +4,36 @@ using namespace app::browser::main::tab::page::content::text;
 
 Gemini::Gemini(
     const Glib::ustring & GEMTEXT
+) : Gtk::Viewport( // add scrolled window features support
+    NULL,
+    NULL
 ) {
-    // Init widget
-    set_valign(
-        Gtk::Align::START
+    set_scroll_to_focus(
+        false
     );
 
-    set_wrap(
-        true
+    auto label = Gtk::make_managed<Gtk::Label>( // @TODO separated file?
+        GEMTEXT
     );
 
-    set_selectable(
-        true
-    );
+        // Init widget
+        label->set_valign(
+            Gtk::Align::START
+        );
 
-    set_use_markup(
-        true
-    );
+        label->set_wrap(
+            true
+        );
 
-    set_markup(
-        GEMTEXT//markup
+        label->set_selectable(
+            true
+        );
+
+        label->set_use_markup(
+            true
+        );
+
+    set_child(
+        * label
     );
 }