Although not using Ubuntu directly, I am using Mint, which is based on it (Tina 
- 19.2, based on Bionic, MATE edition). Might be the same problem. If not 
applicable, then please ignore my comment.
I can reproduce this in all machines I have, in a few simple steps:

1-Open a terminal and leave 'top' open to check the processes;
2-Open 'xed'
3-Press shift inside of xed
4-Look at the terminal running top
5-To make it stop using 100% cpu, simply change focus to any window other than 
xed (the terminal, for example).

This happens everytime, and is really annoying. If I try to copy text (ctrl-c), 
it triggers the bug as well, and forces me to change focus to have the system 
become usable again.
I have attached a screenshot of my top output while the bug is happening. 
Before triggering it, all processes were running below 1% according to top.

** Attachment added: "Screenshot at 2020-01-07 11-15-44.png"

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  ibus-* randomly use high CPU

Status in The Ubuntu Power Consumption Project:
Status in ibus package in Ubuntu:

Bug description:
  ibus-* randomly use high CPU in Ubuntu 18.04

  In fact, I think it's now using more CPU overall than the shell itself
  is to redraw a 4K screen:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND   
   3308 dan       20   0 4009804 192676  84804 R  45.7  2.4   1:13.65 
   3352 dan       20   0  384364  26796  20552 S  13.9  0.3   0:22.81 ibus-x11  
   3372 dan       20   0  217944  10620   7764 S  10.9  0.1   0:16.20 
   3350 dan       20   0  293828  10384   7516 R  10.6  0.1   0:16.54 
   3346 dan       20   0  374572  11944   8268 S  10.3  0.1   0:15.93 

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ibus 1.5.17-3ubuntu4
  ProcVersionSignature: Ubuntu 4.15.0-19.20-generic 4.15.17
  Uname: Linux 4.15.0-19-generic x86_64
  ApportVersion: 2.20.9-0ubuntu6
  Architecture: amd64
  Date: Tue Apr 24 15:29:07 2018
  InstallationDate: Installed on 2017-12-12 (133 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211)
  SourcePackage: ibus
  UpgradeStatus: No upgrade log present (probably fresh install)

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