Document new setting

README.md

@@ -32,6 +32,7 @@ jupyter lab build
 
 Once installed, extension behavior can be modified via the following settings which can be set in JupyterLab's advanced settings editor:
 
+-   **blockWhileCommandExecutes**: suspend JupyterLab interaction until Git commands (e.g., `commit`, `pull`, `reset`, `revert`) finish executing. Setting this to `true` helps mitigate potential race conditions leading to data loss, conflicts, and a broken Git history. Unless running a slow network, UI suspension should not interfere with standard workflows. Setting this to `false` allows for actions to trigger multiple concurrent Git actions.
 -   **cancelPullMergeConflict**: cancel pulling changes from a remote repository if there exists a merge conflict. If set to `true`, when fetching and integrating changes from a remote repository, a conflicting merge is canceled and the working tree left untouched.
 -   **disableBranchWithChanges**: disable all branch operations, such as creating a new branch or switching to a different branch, when there are changed/staged files. When set to `true`, this setting guards against overwriting and/or losing uncommitted changes.
 -   **historyCount**: number of commits shown in the history log, beginning with the most recent. Displaying a larger number of commits can lead to performance degradation, so use caution when modifying this setting.