Can't do select-expr while reload-modified is active

[cool-RR]

When trying to run select-expr while reload-modified is active, I get this error: still running reload_modified from previous command.

• Does this issue reproduce without any plugins or configuration (using the -N CLI flag)?

Yes.

• Does this issue reproduce with either the latest release, or with the develop branch?
  Yes.

Additional context

• What platform and version are you using (Linux, MacOS, Windows)?

Ubuntu

• Which version of Python?

Python 3.12.3

• Which terminal are you using (for display and input issues)?

Windows Terminal, SSH, zsh.

[midichef]

Duplicate the sheet with dup-rows (g") so you can run z| on the copy.

While sheet data is being changed by any long-running thread, manipulating the data is likely to run into problems. You may think selecting rows during reload is passive, and therefore consider it safe. But it's so complex in implementation that I don't know if Visidata aims to support that use case.

So instead, my general approach to such situations would always be to make a safe copy of the data and work with that.

@saulpw For future reference, are there situations where dup-rows-deep (gz") must be used instead of dup-rows?

[cool-RR]

I appreciate this as a workaround, but I hope it won't be the official solution.

[saulpw]

@saulpw For future reference, are there situations where dup-rows-deep (gz") must be used instead of dup-rows?

dup-rows-deep is only necessary if you want to modify cells (either the source or the copy) without having the changes reflected back to other sheets. If you only use VisiData read-only, there is no need for it.

Row selection uses its own data structure separate from the list of rows. Selecting rows should be fine even while the sheet is loading or sorting or whatever.