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I'm displaying a file contents by using :pedit …the-file-path…, to then call popup_setoptions(…the-ID…,#{firstline:anumber}) in order to scroll the popup and highlight/show the desired part of the file.

There's however one problem — the folds are closed by default and thus they hide the file contents… How to open them?

What I've tried is a exe ':'.pupid.'windo norm! zi' however the command fails upfront with and 'Invalid range` error. The pupid is being obtained via popup_findpreview() and is correct.

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    you can possibly use :pedit +set\ nofoldenable <file>. – Christian Brabandt Sep 4 '20 at 12:47
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    Can confirm that :pedit +set\ nofoldenable <file> works too; IMO, it should be the accepted answer. – user938271 Sep 4 '20 at 13:49
  • @ChristianBrabandt Would you post it as an answer please? – filbranden♦ Sep 4 '20 at 19:21
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    @filbranden thanks done – Christian Brabandt Sep 7 '20 at 8:36
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What I've tried is a exe ':'.pupid.'windo norm! zi' however the command fails upfront with and 'Invalid range` error. The pupid is being obtained via popup_findpreview() and is correct.

That's because popup_findpreview() gives you a window ID, but the range passed to :windo expects window numbers:

:[range]windo {cmd} Execute {cmd} in each window or if [range] is given only in windows for which the window number lies in the [range]. It works like doing this: >

Try to use win_execute() instead of :windo:

call win_execute(pupid, 'norm! zi')

The latter is better anyway, because it has fewer side-effects.

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    It works! I've had to use zR instead of zi, however. – Mooncer Sep 4 '20 at 12:46
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If you look at the help for the :pedit command, you will see this:

                                                    :ped :pedit
:ped[it][!] [++opt] [+cmd] {file}
            Edit {file} in the preview window.  The preview window is
            opened like with :ptag.  The current window and cursor
            position isn't changed.  Useful example: 
                    :pedit +/fputc /usr/include/stdio.h

Note that you can use the +cmd command to execute an additional command when opening the preview window. In your case, you can open the file and disallowing folding by using this command then:

:pedit +setl\ nofoldenable <file>

Not, that you need to escape the whitespace between the :setl and the actual option value. You can probably also add an additional command to scroll to the required line, e.g. something like this:

:pedit +setl\ nofoldenable|44 <file>

To open <file>, disable folding in that window and jump to line 44.

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