Public bug reported:

STEPS TO REPRODUCE
 1. Click the menu
 2. While not highlighting any menu item, type a
 3. Mouse over the results
 4. Use the scroll wheel to move down a screen

Note there are additional results despite no scroll bar being displayed.

Two idiosyncracies regarding #2:
 1. This works in English. If you have another language, especially one that 
does not use Latin characters, you will certainly want to use a different 
character. 
 2. The important thing is that you have a set of results that are greater than 
the maximum number of entries to display. To see that, right click on the menu 
button and click "Configure Application Menu" and then look at the value for 
"Maximum visible items," which defaults to 10.

EXPECTED RESULTS
A scroll bar should be visible. You'll notice one is if you use, for example, 
the Ambience LXQt theme.

ACTUAL RESULTS
The scroll bar is entirely invisible.

NOTES
Looks like this is in Ambience:

#MainMenu QScrollBar::handle {
    background-color: palette(highlighted-text);
    color: palette(highlighted-text);
}

but there does not seem to be something similar in our theme.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: lubuntu-artwork 1.6
ProcVersionSignature: Ubuntu 4.17.0-6.7-generic 4.17.9
Uname: Linux 4.17.0-6-generic x86_64
ApportVersion: 2.20.10-0ubuntu7
Architecture: amd64
CurrentDesktop: LXQt
Date: Fri Aug 17 01:30:05 2018
Dependencies:
 
InstallationDate: Installed on 2018-08-17 (0 days ago)
InstallationMedia: Lubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180815)
PackageArchitecture: all
SourcePackage: lubuntu-artwork
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lubuntu-artwork (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1787734

Title:
  Lubuntu Arc theme hides menu scroll bar when searching

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