Public bug reported:

Lubuntu 19.04 daily ISO image QA-test

My displays are vertically positioned (one above the other). I adjusted
monitor-settings to reflect this, then added a second panel on other
display.

Whenever I click the menu-icon on 2nd panel, i get pixels flash & show
at top of screen, but no menu appears.  If i click again on menu-icon
the pixels (bottom of menu??) disappear.

I used monitor-settings to reverse displays (ie. as if my bottom monitor
was on top, and my top monitor was now at bottom), and again the second
display/monitor menu-icon would not work, with pixels now appearing at
top of my upper-most-display  (ie. same result just on different
monitor, on newly created panel, the pre-created menu-icon & panel
worked correctly.


This is LOW-importance, as the primary panel menu-icon works as expected. I 
could NOT trip it except by adding second panel (ie. primary/default panel was 
flawless in my testing)


This is also very similar to two other reports I've made; in fact when I ran 
ubuntu-bug, firefox opened with its window part on one display, part on the 
other with the middle strip being hidden below the lxqt-panel  (which had been 
reported before (#1804337) - so this may relate.

---
part of my QA-test report follows
-
hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)
adjust displays to match my setup (vertical setup anyway), add additional panel 
@ bottom of lower display
clicking the menu-icon on 2nd (lower) display on newly created panel did not 
have menu displayed on screen. it looked like it drew at top of screen, as I 
saw pixels top left of screen whenever menu should have appeared (click menu 
off using menu-icon and pixels would disappear). i altered screen so my bottom 
display was position at top (ie. reversed position) & menu-icon on top monitor 
would not display (but pixels at it's top showed when I expected menu). i've 
reported two bugs rather similiar, but not menu related..

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: lxqt-panel 0.13.0-0ubuntu5
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu14
Architecture: amd64
CasperVersion: 1.401
CurrentDesktop: LXQt
Date: Sun Dec 30 10:33:25 2018
LiveMediaBuild: Lubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181229)
SourcePackage: lxqt-panel
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lxqt-panel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco

** Attachment added: "sudo lshw >lshw.txt"
   https://bugs.launchpad.net/bugs/1810079/+attachment/5225787/+files/lshw.txt

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https://bugs.launchpad.net/bugs/1810079

Title:
  panel menu on 2nd display has no viisble menu when clicked-open

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