how to prevent resize of my split windows on every call of term_start() if I do need to use 'termwinsize' option

Question

I have 2 files opened in a vertically split window. I call term_start() and get results in a split window below. I use something like this:

:let foo=term_start("some_script", {'hidden':1, 'term_finish':'open', 'term_opencmd':'botright split +b%d'})

This works great, but often times the script output cannot fit into one line, so it is getting wrapped in the terminal window. This is not something you can fix with ":set nowrap". These terminal-inserted line breaks create problems with visualization of script output and with searches in the terminal window. I learned I can avoid this by setting 'termwinsize' option to a big number:

:set termwinsize=0*999

This helps, but it creates a different problem - now every time I call term_start() my active window/buffer is for some reasons getting resized to occupy the entire screen space and leaving just one-character wide window for the other buffer.

I'm using (linux) gvim version 8.1.1561

Answer 1

I know you said you "don't want to leave vim [terminal] window" and "Vim 8.1 is supposed to have [a] fully featured [sic] terminal"—but let's consider that

1. You have to leave the terminal to do editing; and,
2. No "fully featured [sic] terminal" that I am aware of prevents programs run in it from doing any line wrapping they want to.

So, I propose the use of a file as intermediary: most programs disable line-wrapping when writing to a file (I'm unclear if this is a result of a lower level stdio routine, or a conscious decision on the part of the programmer). This has the benefit that we're ready to edit—which is why we use vim in the first place.

There are many ways to do so:

1. :term, run your cmd > file, then Ctrl-w:edit file
2. :enew | execute "read !cmd" | 0d
3. :Clam cmd (if you use Clam)
4. :term, run your cmd, copy the output using term normal mode, paste into :enew, then J or :join the appropriate lines

_{Consider this a frame-challenge answer—it may be what you wanted, but it might help you or others solve the problem}