implement base button sensitivity update

src/browser/main/tab/page/navigation/request.rs

@@ -1,5 +1,5 @@
 use gtk::{
-    glib::GString,
+    glib::{GString, Uri, UriFlags},
     prelude::{EditableExt, EntryExt, WidgetExt},
     Entry,
 };
@@ -66,4 +66,11 @@ impl Request {
     pub fn text(&self) -> GString {
         self.widget.text()
     }
+
+    pub fn uri(&self) -> Option<Uri> {
+        match Uri::parse(&self.widget.text(), UriFlags::NONE) {
+            Ok(uri) => Some(uri),
+            _ => None,
+        }
+    }
 }