use different states to disable buttons when there is no changes

Author: Simek

crates/git_ui/src/project_diff.rs

@@ -911,6 +911,7 @@ struct ButtonStates {
 
 impl Render for ProjectDiffToolbar {
     fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        println!("{:?}", self.project_diff(cx));
         let Some(project_diff) = self.project_diff(cx) else {
             return div();
         };
@@ -947,7 +948,11 @@ impl Render for ProjectDiffToolbar {
                                     &StageAndNext,
                                     &focus_handle,
                                 ))
-                                .disabled(!button_states.stage)
+                                .disabled(
+                                    !button_states.prev_next
+                                        && !button_states.stage_all
+                                        && !button_states.unstage_all,
+                                )
                                 .on_click(cx.listener(|this, _, window, cx| {
                                     this.dispatch_action(&StageAndNext, window, cx)
                                 })),
@@ -959,7 +964,11 @@ impl Render for ProjectDiffToolbar {
                                     &UnstageAndNext,
                                     &focus_handle,
                                 ))
-                                .disabled(!button_states.unstage)
+                                .disabled(
+                                    !button_states.prev_next
+                                        && !button_states.stage_all
+                                        && !button_states.unstage_all,
+                                )
                                 .on_click(cx.listener(|this, _, window, cx| {
                                     this.dispatch_action(&UnstageAndNext, window, cx)
                                 })),