[winswitch] Empty "Start" menu in the HTML5 client

[Troll Berserker]

Hi,

I'm running
xpra GTK2 X11 version 2.5-r22138 64-bit
as a server and use
xpra-html5-3.0-0.20190612r22922.el7_6.noarch.rpm
as a client.

I'm starting the server with `start-new-commands = yes` set in configs.
Starting the server with `-d menu` option shows that `.desktop` files are loaded.
Here is a fragment of the log:

2019-06-16 01:05:11,023 Type=Application (<type 'unicode'>)
2019-06-16 01:05:11,023 VersionString= (<type 'str'>)
2019-06-16 01:05:11,023 Name=Xpra (<type 'unicode'>)
2019-06-16 01:05:11,023 GenericName= (<type 'str'>)
2019-06-16 01:05:11,023 NoDisplay=False (<type 'bool'>)
2019-06-16 01:05:11,023 Comment=Xpra GUI (<type 'unicode'>)
2019-06-16 01:05:11,024 Icon=xpra (<type 'unicode'>)
2019-06-16 01:05:11,024 Hidden=False (<type 'bool'>)
2019-06-16 01:05:11,024 OnlyShowIn=[] (<type 'generator'>)
2019-06-16 01:05:11,024 NotShowIn=[] (<type 'generator'>)
2019-06-16 01:05:11,024 Exec=xpra (<type 'unicode'>)
2019-06-16 01:05:11,025 TryExec= (<type 'str'>)
2019-06-16 01:05:11,025 Path= (<type 'str'>)
2019-06-16 01:05:11,025 Terminal=False (<type 'bool'>)
2019-06-16 01:05:11,025 MimeTypes=[] (<type 'generator'>)
2019-06-16 01:05:11,025 Categories=[u'Network', u'RemoteAccess'] (<type 'generator'>)
2019-06-16 01:05:11,025 StartupNotify=False (<type 'bool'>)
2019-06-16 01:05:11,025 StartupWMClass= (<type 'str'>)
2019-06-16 01:05:11,025 URL= (<type 'str'>)
2019-06-16 01:05:11,025 properties(Xpra)={'Comment': u'Xpra GUI', 'MimeTypes': [], 'StartupWMClass': '', 'NoDisplay': False, 'Name': u'Xpra', 'Exec': u'xpra', 'URL': '', 'TryExec': '', 'StartupNotify': False, 'OnlyShowIn': [], 'Terminal': False, 'GenericName': '', 'VersionString': '', 'Path': '', 'NotShowIn': [], 'Hidden': False, 'Type': u'Application', 'Categories': [u'Network', u'RemoteAccess'], 'Icon': u'xpra'}
2019-06-16 01:05:11,068 got icon data from '/usr/share/icons/xpra.png': 3011 bytes

However, the "Start" menu in the HTML5 client is completely empty.
What I'm doing wrong?