Viewing PDF doesn't use full screen width

[Alistair Cunningham]

In Thunderbird 91, clicking on a .pdf attachment to an email loads the PDF file in a new tab, which is good. However, the view of the PDF file only uses about 2/3rds of the screen width, and leaves a large empty grey area on the right hand side of the screen. Zooming in on the document only zooms within the existing area, and does not expand to the grey area.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: thunderbird 1:91.1.1+build2-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: alistair 2076 F.... pulseaudio
 /dev/snd/pcmC0D0p: alistair 2076 F...m pulseaudio
BuildID: 20210916142849
CasperMD5CheckResult: unknown
Channel: Unavailable
CurrentDesktop: Unity:Unity7:ubuntu
Date: Thu Sep 30 10:33:51 2021
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 # Include files from /etc/network/interfaces.d:
 source-directory /etc/network/interfaces.d
IncompatibleExtensions:
 Lightning - {e2fda1a4-762b-4020-b5ad-a41df1933103}
 English (GB) Language Pack - <email address hidden>
 Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2020-07-14 (442 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
IpRoute:
 default via 172.30.3.254 dev wlp0s20f3 proto dhcp metric 600
 10.0.0.0/24 dev wg0 proto kernel scope link src 10.0.0.2
 169.254.0.0/16 dev wg0 scope link metric 1000
 172.30.0.0/22 dev wlp0s20f3 proto kernel scope link src 172.30.0.92 metric 600
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:359
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=91.1.1/20210916142849 (In use)
RebootRequiredPkgs: Error: path contained symlinks.
RunningIncompatibleAddons: True
SourcePackage: thunderbird
UpgradeStatus: Upgraded to impish on 2021-09-24 (6 days ago)
dmi.bios.date: 06/21/2021
dmi.bios.release: 1.19
dmi.bios.vendor: LENOVO
dmi.bios.version: N2WET29W (1.19 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20U9CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.8
dmi.modalias: dmi:bvnLENOVO:bvrN2WET29W(1.19):bd06/21/2021:br1.19:efr1.8:svnLENOVO:pn20U9CTO1WW:pvrThinkPadX1CarbonGen8:skuLENOVO_MT_20U9_BU_Think_FM_ThinkPadX1CarbonGen8:rvnLENOVO:rn20U9CTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon Gen 8
dmi.product.name: 20U9CTO1WW
dmi.product.sku: LENOVO_MT_20U9_BU_Think_FM_ThinkPad X1 Carbon Gen 8
dmi.product.version: ThinkPad X1 Carbon Gen 8
dmi.sys.vendor: LENOVO

[Alistair Cunningham (acunningham)]

Reported upstream:

https://bugzilla.mozilla.org/show_bug.cgi?id=1735480

[Sebastien Bacher (seb128)]

Thanks for reporting it upstream! The issue is not happening here using the current 91.1.2 deb or the 91.2.0 snap

[Alistair Cunningham (acunningham)]

I deleted my userContent.css, and the problem is fixed. Sorry to have wasted your time! You're welcome to close this bug report.

[Sebastien Bacher (seb128)]

Thanks, closing then. There might still be a bug though if userContent.css got in a buggy state unless you manually edited it? Anyway that's more of an upstream question and can be discussed on their bugzilla if needed

[Alistair Cunningham (acunningham)]

Yes, I had manually edited userContent.css quite a few years ago for a formatting problem on a much older version of Thunderbird, and never got round to removing my edits.