Fix integration test verifying the rename behavior

Specifically, the test now ensures that the host's worktree observes a/file1's
change event *before* the rename occurs, otherwise when interpreting the change
event it will mistakenly think that the file has been deleted (because its path
has changed) and will subsequently fail to detect the rename, causing the test
to fail.

crates/server/src/rpc.rs

@@ -1238,7 +1238,7 @@ mod tests {
             LanguageConfig, LanguageRegistry, LanguageServerConfig, Point,
         },
         lsp,
-        project::{DiagnosticSummary, Project, ProjectPath},
+        project::{worktree::WorktreeHandle, DiagnosticSummary, Project, ProjectPath},
     };
 
     #[cfg(test)]
@@ -1608,6 +1608,11 @@ mod tests {
         buffer_b.read_with(&cx_b, |buf, _| assert!(!buf.is_dirty()));
         buffer_c.condition(&cx_c, |buf, _| !buf.is_dirty()).await;
 
+        // Ensure worktree observes a/file1's change event *before* the rename occurs, otherwise
+        // when interpreting the change event it will mistakenly think that the file has been
+        // deleted (because its path has changed) and will subsequently fail to detect the rename.
+        worktree_a.flush_fs_events(&cx_a).await;
+
         // Make changes on host's file system, see those changes on guest worktrees.
         fs.rename(
             "/a/file1".as_ref(),