Menus aren't populated first time

[Alistair Cunningham]

If you navigate using the mouse to a menu that has a submenu, for example View -> Toolbars, sometimes the first time you do so, the submenu is empty and only shows as a very small grey rectangle. If you then move the mouse pointer away from the menu, click in the middle of a web page, wait a few seconds, and then try the submenu again, the submenu is appears correctly.

Firefox 70.0.1 is also affected by this problem, and I have reported it in bug 1854753.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: thunderbird 1:68.2.1+build1-0ubuntu0.19.10.1
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: alistair 2189 F.... pulseaudio
BuildID: 20191031211131
Channel: Unavailable
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Dec 2 10:35:43 2019
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
 dns-search integrics.com
IncompatibleExtensions:
 Lightning - {e2fda1a4-762b-4020-b5ad-a41df1933103}
 English (GB) Language Pack - <email address hidden>
 Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2017-08-16 (837 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
IpRoute:
 default via 172.20.0.1 dev wlp58s0 proto dhcp metric 600
 169.254.0.0/16 dev wlp58s0 scope link metric 1000
 172.20.0.0/20 dev wlp58s0 proto kernel scope link src 172.20.0.120 metric 600
MostRecentCrashID: bp-f7ee5fe5-1543-4438-9493-dbd8f0170707
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:1141
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=68.2.1/20191031211131 (In use)
RunningIncompatibleAddons: True
SourcePackage: thunderbird
UpgradeStatus: Upgraded to eoan on 2019-10-04 (58 days ago)
dmi.bios.date: 08/30/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET56W (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HFCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1WET56W(1.35):bd08/30/2019:svnLENOVO:pn20HFCTO1WW:pvrThinkPadT470s:rvnLENOVO:rn20HFCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470s
dmi.product.name: 20HFCTO1WW
dmi.product.sku: LENOVO_MT_20HF_BU_Think_FM_ThinkPad T470s
dmi.product.version: ThinkPad T470s
dmi.sys.vendor: LENOVO

[Olivier Tilloy (osomon)]

Let's not track this in two separate bugs. The same code (unity-menubar.patch) is responsible for Unity menus in firefox and thunderbird.