How to remove the `||` marks on the left of the quickfix output?

[garrett361]

My typical quickfix output looks like (for a python file, my usual use case):

|| R=tensor([[-0.9987+0.j,  0.0199+0.j, -0.0470+0.j],
||         [-0.0481+0.j, -0.6765+0.j,  0.7349+0.j],
||         [-0.0171+0.j,  0.7362+0.j,  0.6765+0.j]])
|| 
|| R@R.T=tensor([[ 1.0000e+00+0.j, -1.2576e-09+0.j, -2.4934e-09+0.j],
||         [-1.2576e-09+0.j,  1.0000e+00+0.j,  4.1653e-09+0.j],
||         [ 0.0000e+00+0.j,  0.0000e+00+0.j,  1.0000e+00+0.j]])
|| 
|| eigvals=tensor([-0.9993+0.0371j, -0.9993-0.0371j,  1.0000+0.0000j])
[...]

I would like to completely remove the || on the left of the output. How can I accomplish this?
I'm launching with templates that use components = { { "on_output_quickfix", open = true }, "default" }

I saw this somewhat mentioned in #45, but I didn't really understand how to remove these || symbols. Do I need to change errorformat or something?

[garrett361]

Hmm, I found that my errorformat included %f|%l| %m as one entry. I thought deleting this and replacing with %m would accomplish what I want, but it did not.

I'm also finding that if I add %f the output changes to:

R=tensor([[ 0.0673+0.j, -0.6867+0.j,  0.7238+0.j],|| 
[-0.4553+0.j, -0.6666+0.j, -0.5901+0.j],|| 
[ 0.8878+0.j, -0.2899+0.j, -0.3575+0.j]])|| 
|| 
R@R.T=tensor([[ 1.0000e+00+0.j, -2.7138e-08+0.j, -2.7308e-08+0.j],|| 
[-2.7138e-08+0.j,  1.0000e+00+0.j, -3.7264e-08+0.j],|| 
[-2.9802e-08+0.j, -4.4703e-08+0.j,  1.0000e+00+0.j]])|| 
|| 
eigvals=tensor([ 1.0000+1.4901e-08j, -0.9785+2.0648e-01j, -0.9785-2.0648e-01j])|| 
|| 
[...]

Not finding the right incantations here.