Disable restore hunk control for created files (#25841)

Release Notes:

- Git Beta: disable hunk restore action and button for created files

crates/editor/src/editor.rs

@@ -261,6 +261,7 @@ enum DisplayDiffHunk {
         display_row: DisplayRow,
     },
     Unfolded {
+        is_created_file: bool,
         diff_base_byte_range: Range<usize>,
         display_row_range: Range<DisplayRow>,
         multi_buffer_range: Range<Anchor>,
@@ -7895,6 +7896,9 @@ impl Editor {
         hunk: &MultiBufferDiffHunk,
         cx: &mut App,
     ) -> Option<()> {
+        if hunk.is_created_file() {
+            return None;
+        }
         let buffer = self.buffer.read(cx);
         let diff = buffer.diff_for(hunk.buffer_id)?;
         let buffer = buffer.buffer(hunk.buffer_id)?;
@@ -17282,6 +17286,7 @@ impl EditorSnapshot {
                     if hunk_display_end.column() > 0 {
                         end_row.0 += 1;
                     }
+                    let is_created_file = hunk.is_created_file();
                     DisplayDiffHunk::Unfolded {
                         status: hunk.status(),
                         diff_base_byte_range: hunk.diff_base_byte_range,
@@ -17291,6 +17296,7 @@ impl EditorSnapshot {
                             hunk.buffer_id,
                             hunk.buffer_range,
                         ),
+                        is_created_file,
                     }
                 };
 

crates/editor/src/element.rs

@@ -3948,6 +3948,7 @@ impl EditorElement {
                 display_row_range,
                 multi_buffer_range,
                 status,
+                is_created_file,
                 ..
             } = &hunk
             {
@@ -3979,6 +3980,7 @@ impl EditorElement {
                         display_row_range.start.0,
                         status,
                         multi_buffer_range.clone(),
+                        *is_created_file,
                         line_height,
                         &editor,
                         cx,
@@ -8786,6 +8788,7 @@ fn diff_hunk_controls(
     row: u32,
     status: &DiffHunkStatus,
     hunk_range: Range<Anchor>,
+    is_created_file: bool,
     line_height: Pixels,
     editor: &Entity<Editor>,
     cx: &mut App,
@@ -8801,6 +8804,7 @@ fn diff_hunk_controls(
         .rounded_b_lg()
         .bg(cx.theme().colors().editor_background)
         .gap_1()
+        .occlude()
         .child(if status.has_secondary_hunk() {
             Button::new(("stage", row as u64), "Stage")
                 .alpha(if status.is_pending() { 0.66 } else { 1.0 })
@@ -8879,7 +8883,8 @@ fn diff_hunk_controls(
                             editor.restore_hunks_in_ranges(vec![point..point], window, cx);
                         });
                     }
-                }),
+                })
+                .disabled(is_created_file),
         )
         .when(
             !editor.read(cx).buffer().read(cx).all_diff_hunks_expanded(),

crates/multi_buffer/src/multi_buffer.rs

@@ -154,6 +154,11 @@ impl MultiBufferDiffHunk {
             secondary: self.secondary_status,
         }
     }
+
+    pub fn is_created_file(&self) -> bool {
+        self.diff_base_byte_range == (0..0)
+            && self.buffer_range == (text::Anchor::MIN..text::Anchor::MAX)
+    }
 }
 
 #[derive(PartialEq, Eq, Ord, PartialOrd, Clone, Hash, Debug)]