Add a double click to reset resized splits (#2762)

fixes https://github.com/zed-industries/community/issues/1791

Release Notes:

- Double clicking on split resize handles now resets the split's
dimensions
0e9cad4935Mikayla Maki committed on 7/20/2023, 5:55:19 PM· committed by GitHubparents372f66cd84d663
1 file changedLine totals unavailable