ArchiveInfo.solid - Wrong result

[ganego]

Describe the bug
ArchiveInfo.solid gives wrong result.

To Reproduce
I created an archive of 12 jpeg files, for a total of 32 MB with 7z 19.00, compression level: Fastest, Solid Block Size: 8 MB.
I verified in 7z that the archive is indeed solid (Info button -> solid had a +).

import py7zr
sz = py7zr.SevenZipFile(path)
print(sz.archiveinfo().solid)

Returns False for those archives, despite them being solid.

Environment (please complete the following information):

• OS: [W7x64]
• Python [Python 3.8.1 x64]
• py7zr version: [py7zr-0.5-py3-none-any from pip]

[ganego]

This is the code from \CPP\7zip\Archive\7z\7zIn.h in case it helps.

  bool IsSolid() const
  {
    for (CNum i = 0; i < NumFolders; i++)
      if (NumUnpackStreamsVector[i] > 1)
        return true;
    return false;
  }

[miurahr]

@ganego could you check PR #97 ?

[ganego]

@miurahr I tested with a couple of different 7z archives and it seems to work.
Thank you for investing your time and creating this library :)