style: Enforce no trailing white spaces

[yedayak]

Also fix all current ones

[akinomyoga]

These trailing white spaces in compgen/t{1..3}.txt are produced by Bash's declare. However, the files compgen/t{1..3}.txt don't seem to be used by tests. They were added by commit c9c98da, but I'm not sure the reason that these files are added. At least, even if I remove those files, the following tests still pass:

$ pytest test/t/test_screen.py
$ pytest test/t/test_compgen.py
$ pytest test/t/unit

Can we remove these files?

[akinomyoga]

This is what ip addr produces. Shouldn't we use the output of ip addr as is for testing purposes? For example, to ensure that the completion generation still works with trailing white spaces. shared/bin/ifconfig for ifconfig -a is similar.

[scop]

I think I'd rather not do this. At least some of the affected files are intentional as-is copies of outputs etc that are better left as-is. For cases where it "matters" more we already have shfmt taking care of it for shell code, and ruff for python.

[yedayak]

I think I'd rather not do this. At least some of the affected files are intentional as-is copies of outputs etc that are better left as-is. For cases where it "matters" more we already have shfmt taking care of it for shell code, and ruff for python.

Yeah makes sense, thanks for the review