QZip setting wrong Exe* permissions

The function permissionsToMode(...) inside qzip.cpp is converting permissions QFile::ExeOwner and QFile::ExeUser to UnixFileAttributes::WriteUser instead of UnixFileAttributes::ExeUser.

As a result, folders within the ZIP archive will be extracted with missing permission attributes which will prevent navigation within the folders and subfolders.

This also causes a problem when using QZipReader::extractAll(). During the decompression of the archive with QZipReader::extractAll() files and folders lose the attribute QFile::ExeOwner and QFile:ExeUser (even if set during archive creation) which is particularly disturbing for folders and prevents folder navigation. The extractAll() function fails to decompress files included in the sub-folders and returns false.

The fix is changing the lines:

    if (perms & (QFile::ExeOwner | QFile::ExeUser))
        mode |= UnixFileAttributes::WriteUser;

into:

    if (perms & (QFile::ExeOwner | QFile::ExeUser))
        mode |= UnixFileAttributes::ExeUser;

This is indeed a very old bug since Qt v5 and probably earlier. Previously the fix was rejected as QZip was not part of the public API (QTBUG-54938). As QZip is now part of the public Qt API, I hope this will get some attention and get fixed. Because of this Qt bug, we have to use a third-party ZIP library, which is a pity.

Truly hope this will get some attention and gets fixed sooner than later.