I've found the problem. I have poor eyesight, and have my minimum font size is set to 15 points. However, the font for monospace for the latin character set was set to "Default (DejaVu Sans Mono)" 12 point. Upon changing this to 15 point to match my minimum font size, the text wraps at 72 characters as it should. It seems that the font scaling doesn't correctly handle differences between the chosen font and minimum font size.
HTML composition seems to be unaffected. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1850803 Title: Wrong wrap length when composing emails Status in Mozilla Thunderbird: Invalid Status in thunderbird package in Ubuntu: Incomplete Bug description: After upgrading to Ubuntu 19.10, Thunderbird seems to use the wrong wrap length when composing emails. I have mail.wrap_long_lines set to true, and mailnews.wraplength set to 72, but when composing emails, lines are wrapped at a shorter length. It appears to be about 55 characters. Emails that I have sent are displayed correctly, so the problem only happens when composing. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: thunderbird 1:68.1.2+build1-0ubuntu1 ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1 Uname: Linux 5.3.0-19-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair AddonCompatCheckDisabled: False ApportVersion: 2.20.11-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alistair 30823 F.... pulseaudio BuildID: 20191010144232 Channel: Unavailable CurrentDesktop: Unity:Unity7:ubuntu Date: Thu Oct 31 10:47:12 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 - langpack-en...@thunderbird.mozilla.org Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd} InstallationDate: Installed on 2017-08-16 (805 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) IpRoute: default via 172.20.64.1 dev wlp58s0 proto dhcp metric 600 169.254.0.0/16 dev wlp58s0 scope link metric 1000 172.20.64.0/19 dev wlp58s0 proto kernel scope link src 172.20.71.127 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=68.1.2/20191010144232 (In use) RunningIncompatibleAddons: True SourcePackage: thunderbird UpgradeStatus: Upgraded to eoan on 2019-10-04 (26 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 To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1850803/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp