vim fixes for find&replace (#2995)

* allow replacing with the empty string to delete
* fix <enter> for ReplaceNext (in vim mode)

Release Notes:

- allow replacement to be empty
f4d4a2f41bConrad Irwin committed on 9/20/2023, 10:42:39 PM· committed by GitHubparentsee16b202da664e
3 files changedLine totals unavailable