Allocating size to GtkBox 0x563732796750 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate?

[dino99]

After upgrading gnome-terminal to 3.26 (from 3.24), that error is still logged.
Some old workarounds (might be irrelevant now):
https://github.com/budgie-desktop/budgie-desktop/issues/532
https://github.com/budgie-desktop/budgie-desktop/commit/ff3d7c9c0fc17f4fb23c172f8c8874ab4a7d6602

Related upstream discussions:
https://bugzilla.gnome.org/show_bug.cgi?id=771899; points to vte bad calls

https://bugzilla.gnome.org/show_bug.cgi?id=791014

Doc: https://developer.gnome.org/vte/0.50/VteTerminal.html

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-terminal 3.26.2-3ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-30.33-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Jan 21 07:58:18 2018
EcryptfsInUse: Yes
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-terminal
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Egmont Koblinger (egmont-gmail)]

Upstream bug, investigation, VTE workaround etc. at https://bugzilla.gnome.org/show_bug.cgi?id=769566.

[Egmont Koblinger (egmont-gmail)]

vte-0.51.92 includes the workaround, so the warning is no longer emitted.