Restore file to original content when rejecting file recreated by agent (#29264)

Release Notes:

- Fixed a bug that could sometimes cause a file to be deleted when
rejecting an agent change.

crates/assistant_tools/src/contents_tool.rs

@@ -209,7 +209,7 @@ impl Tool for ContentsTool {
                     })?;
 
                     action_log.update(cx, |log, cx| {
-                        log.buffer_read(buffer, cx);
+                        log.track_buffer(buffer, cx);
                     })?;
 
                     Ok(result)
@@ -221,7 +221,7 @@ impl Tool for ContentsTool {
                         let result = buffer.read_with(cx, |buffer, _cx| buffer.text())?;
 
                         action_log.update(cx, |log, cx| {
-                            log.buffer_read(buffer, cx);
+                            log.track_buffer(buffer, cx);
                         })?;
 
                         Ok(result)