Fix Git diff rendering

src/app.rs

@@ -425,6 +425,7 @@ pub(crate) enum Message {
     ToggleGitFile(PathBuf),
     OpenGitDiff(PathBuf),
     SetGitDiffMode(GitDiffMode),
+    GitDiffScrolled(scrollable::Viewport),
     GitCommitMessageChanged(String),
     GitStageSelected,
     GitUnstageSelected,
@@ -1755,6 +1756,16 @@ impl App {
             Message::ToggleGitFile(path) => self.toggle_git_file(path),
             Message::OpenGitDiff(path) => self.open_git_diff(&path),
             Message::SetGitDiffMode(mode) => self.git_diff_mode = mode,
+            Message::GitDiffScrolled(viewport) => {
+                let offset = scrollable::AbsoluteOffset {
+                    x: viewport.absolute_offset().x,
+                    y: 0.0,
+                };
+                return Task::batch([
+                    iced::widget::operation::scroll_to(git_diff_old_scroll_id(), offset),
+                    iced::widget::operation::scroll_to(git_diff_new_scroll_id(), offset),
+                ]);
+            }
             Message::GitCommitMessageChanged(message) => self.git_commit_message = message,
             Message::GitStageSelected => self.stage_selected_git_files(),
             Message::GitUnstageSelected => self.unstage_selected_git_files(),
@@ -2428,6 +2439,14 @@ pub(super) fn chat_scroll_id() -> iced::widget::Id {
     iced::widget::Id::new("chat-transcript")
 }
 
+pub(super) fn git_diff_old_scroll_id() -> iced::widget::Id {
+    iced::widget::Id::new("git-diff-old")
+}
+
+pub(super) fn git_diff_new_scroll_id() -> iced::widget::Id {
+    iced::widget::Id::new("git-diff-new")
+}
+
 pub(super) fn composer_id() -> iced::widget::Id {
     iced::widget::Id::new("chat-composer")
 }