feat: display save indicator on new files

src/file.rs

@@ -15,7 +15,7 @@ pub struct File {
 impl Default for File {
   fn default() -> Self {
     File {
-      needs_saving: false,
+      needs_saving: true,
       content: text_editor::Content::new(),
       path: None,
       markdown: Vec::new(),

src/state.rs

@@ -75,6 +75,7 @@ impl State {
   pub fn open_file(&mut self, path: PathBuf, content: String) {
     if let Some(index) = self.files.iter().position(|f| f.path() == Some(&path)) {
       self.files[index].set_content(&content);
+      self.files[index].set_needs_saving(false);
       self.current_file = index;
       return;
     }