fix: cant switch btwn files in diff view

src/component/diff_view.rs

@@ -75,6 +75,9 @@ impl DiffViewState {
 
     pub(crate) fn reset(&mut self, line_count: usize) {
         self.0.borrow().list_state.reset(line_count);
+        let mut state = self.0.borrow_mut();
+        state.old_side_highlights = None;
+        state.new_side_highlights = None;
     }
 
     pub(crate) fn old_side_highlights(

src/screen/dashboard/pull_request_diff_view.rs

@@ -85,6 +85,7 @@ impl PullRequestDiffView {
         cx: &mut gpui::Context<Self>,
     ) {
         self.current_file_path = Some(Arc::clone(file_path));
+        self.content_diff_query = None;
         self.start_content_queries(cx);
     }