I think this is because the accounts window is a modal one, and as such
the window manager mandates that it must always remain centered in its
parent window. Consequently, moving the accounts window around means
that the parent window must move too, and for it to move it has to be
unmaximized.
Whether or not this is good from a user perspective is questionable, but
it seems to be the intended behaviour, so not a bug.
** Changed in: thunderbird (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1861746
Title:
moving the "Account Settings" window makes the main window shrink and
move along in the background
Status in thunderbird package in Ubuntu:
Invalid
Bug description:
I start my thunderbird and maximize the main window. Then I open
"Account Settings". This shows the new settings window that is smaller
than the main window (see screenshot "before.png"). This is fine just
like that. But when I start moving the settings window around (by
clicking the top window bar), the main window is being resized to a
very small size, such that it is not visible behind the settings
window. Moreover, it seems to move along with the settings window.
When I close the settings, I can see the very small main window (see
screenshot "after.png").
I actually don't think this is a thunderbird problem, it is probably
something more general. I remember having a similar issue with the
LibreOffice options in Ubuntu 18.04.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: thunderbird 1:68.4.2+build2-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
BuildID: 20200123140255
CurrentDesktop: ubuntu:GNOME
Date: Tue Feb 4 00:33:14 2020
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant
compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @
/usr/lib/thunderbird/omni.ja:greprefs.js:1141
DefaultProfileThemes: extensions.sqlite corrupt or missing
InstallationDate: Installed on 2020-02-02 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
Profiles:
Profile1 (Default) - LastVersion=None/None (Out of date)
Profile0 - LastVersion=68.4.2/20200123140255 (In use)
SourcePackage: thunderbird
UpgradeStatus: No upgrade log present (probably fresh install)
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