Multiline selection errors with test command ("unexpected argument")

[Jiogo18]

Fish version: 3.7.0
Natural Selection version: latest commit (2023-11-27)

Selecting multiple lines tries to execute the lines and gives an error.

How to reproduce

After selecting 2 chars or more on the left:

Source

natural-selection/functions/_natural_selection.fish

Line 46 in ecd61ac

if test -z (commandline --current-selection)

Here, the second line selected is not used as an argument of test -z because of the \n.
It does something like this

Solution

I don't know fish enough. In the idea, it should be something like if test -z "$(commandline --current-selection)".
I don't know if other functions are affected by this.

[daleeidd]

Thank you for the detailed report. All fixed with latest commit.