:Rows does not always keep the current column

[fifthposition]

This could be related to #1 (bad math in both cases?) but may be a special case having to do with how Vim treats help windows. Steps to reproduce:

1. Launch Vim
2. Run :help columcille (e.g.)
3. Run :Rows 4
4. If necessary, switch to help window again. Run :Rows 1

I suspect that when the plugin closes all windows but the help window, Vim just shuts down. (It also shuts down if one opens a help window and then closes the only other open window, which appears to be what’s happening here. Need ☕ to be sure.)