Newly installed applications don't appear in Lancelot and in tree menu. Actually in tree menu there is category for this and they are there but there is no such category in menu editor so there is no way to move them to another category.
I changed categories, in Multimedia I added Video and Audio folders but Multimedia folder still exist so I expected icons for new music apps will be visible there.

I know I can manually add entry but is there any way to auto update?

It could take some time to update. You can try to run

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kbuildsycoca4

and see if it shows up. If it does, you just have to be patient (I think).

It displayed error

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kbuildsycoca4
kbuildsycoca4 running...
kbuildsycoca4(9172) parseLayoutNode: The menu spec file contains a Layout or DefaultLayout tag without the mandatory Merge tag inside. Please fix your file.

but I don't know what how to fix it. But I run

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kbuildsycoca4 --menutest

Multimedia/     kde4-simpleaudioplayer.desktop  /usr/share/applications/kde4/simpleaudioplayer.desktop
Multimedia/     kde4-simpleaudiobrowser.desktop /usr/share/applications/kde4/simpleaudiobrowser.desktop
Multimedia/     deadbeef.desktop        /usr/share/applications/deadbeef.desktop
Multimedia/     sonata.desktop  /usr/share/applications/sonata.desktop
Multimedia/     kde4-kradio4.desktop    /usr/share/applications/kde4/kradio4.desktop
Multimedia/     rhythmbox.desktop       /usr/share/applications/rhythmbox.desktop
Multimedia/     musique.desktop /usr/share/applications/musique.desktop


It sees new apps but still they don't appear in menu Multimedia folder

According to this post those errors are usually safely to ignore. Unfortunately I don't know why those applications don't show up in the menu.

run

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kbuildsycoca4 --noincremental

See what happens. If they don't show up, please post the contents of /usr/share/applications/kde4/kradio4.desktop in "code" tags.

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 kbuildsycoca4 --noincremental
kbuildsycoca4 running...
kbuildsycoca4(2646) parseLayoutNode: The menu spec file contains a Layout or DefaultLayout tag without the mandatory Merge tag inside. Please fix your file.

cat /usr/share/applications/kde4/kradio4.desktop
[Desktop Entry]
Type=Application
Name=kradio4
Exec=kradio4 -caption "%c"
Icon=kradio4
X-DocPath=kradio4/index.html
Comment=V4L/V4L2-Radio Application for KDE4
Terminal=false
Categories=Qt;KDE;AudioVideo;


Seems it has no GenericName entry. No idea whether that's relevant for lancelot, but is should not for kmenuedit.

Just to be sure:
They appear in the Win95 style start menu (do they appear in the other, "kickoff", mode?) but neither in Lancelot nor in kmenuedit?

In Win95 style start menu they appear in recently installed catagory. They don't appear in kmenuedit, kickoff, Lancelot.
The possible reason is that I added Video and Audio as subcategory/folders in Multimedia.
In another user account where I didn't change structure, they appear in Lancelot.

Edit:
Is this a bug? If yes, KDE bug or distribution specific bug?