/usr/sbin/gnome-menus-blacklist is in gnome-menus 3.13.3-9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #! /usr/bin/python3
sourcedir = "/usr/share/applications"
destdir = "/usr/share/gnome/applications"
blacklist_file = "/etc/gnome/menus.blacklist"
import sys, os
# Parse blacklist file
blacklist = []
try:
    with open(blacklist_file, 'r', encoding='utf_8') as fp:
        for l in fp.readlines():
            l = l.strip()
            if l.startswith("#"):
                continue
            blacklist.append(l)
except IOError:
    sys.stderr.write("Warning: %s cannot be opened\n"%blacklist_file)
# Built the list of files to work on
sourcefiles = []
for root, dirs, files in os.walk (sourcedir):
    reldir = root[len(sourcedir)+1:]
    for f in files:
        relfile = os.path.join (reldir, f)
        if relfile.endswith(".desktop") and (f in blacklist or relfile in blacklist):
            sourcefiles.append(relfile)
# Remove obsolete files
for root, dirs, files in os.walk (destdir, topdown=False):
    reldir = root[len(destdir)+1:]
    for f in files:
        relfile = os.path.join (reldir, f)
        if f.endswith(".desktop") and relfile not in sourcefiles:
            os.remove (os.path.join (destdir, relfile))
    if reldir:
        try:
            os.rmdir (root)
        except OSError:
            pass
# Now process the files
for f in sourcefiles:
    sourcefile = os.path.join (sourcedir, f)
    destfile = os.path.join (destdir, f)
    absdir = os.path.dirname (destfile)
    # The mtime is used as a flag to check if the file has changed
    source_time = int (os.stat (sourcefile).st_mtime)
    try:
        dest_time = int (os.stat (destfile).st_mtime)
    except OSError:
        dest_time = 0
    if source_time == dest_time:
        continue
    # Copy file, adding a NoDisplay flag
    if not os.path.isdir (absdir):
        os.makedirs (absdir)
    with open(destfile, 'wt', encoding='utf_8') as fp_out:
        with open(sourcefile, 'rt', encoding='utf_8') as fp_in:
            for l in fp_in.readlines():
                if l.startswith ("NoDisplay="):
                    continue
                fp_out.write(l)
        if not l.endswith ("\n"):
            fp_out.write("\n")
        fp_out.write("NoDisplay=true\n")
    # Set mtime so that the file is not touched unless it has changed
    os.utime (destfile, (source_time, source_time))
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