[Bug 1836659] [NEW] Ubuntu 18.04's ibus package breaks password fields in Firefox again

[pavel heimlich]

Public bug reported:

On an uptodate Ubuntu 18.04.2 LTS system I am observing the same symptoms as in bug 
https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1765304

When I focus a password field in Firefox, it starts focusing and unfocusing rapidly, making it difficult to type passwords.
Also, CPU usage goes up with the 4 processes eating most:
%Cpu(s): 25,3 us, 11,0 sy,  0,0 ni, 63,5 id
Xorg 60%
gnome-flashback 21%
firefox 20%
ibus-daemon 4%

Launching Firefox with 
GTK_IM_MODULE=xim firefox
makes it go away.

This started several (~7) days ago.

$ apt list gnome-shell ibus firefox
Listing... Done
firefox/bionic-updates,bionic-security,now 68.0+build3-0ubuntu0.18.04.1 amd64 [installed]
gnome-shell/bionic-updates,now 3.28.4-0ubuntu18.04.1 amd64 [installed]
ibus/bionic,now 1.5.17-3ubuntu4 amd64 [installed]

$ lsb_release -rd
Description:	Ubuntu 18.04.2 LTS
Release:	18.04

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1836659

Title:
  Ubuntu 18.04's ibus package breaks password fields in Firefox again

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