Focus not where it should be

Steps to reproduce:

0. Make sure you have an image file in your desktop, and that you have a folder somewhere in your filesystem that contains at least one file of any kind. Make also sure you have no window open, or otherwise do Show Desktop so that your desktop is visible.

1. Open a nautilus window and navigate to the a folder that has some files in it. So now a Nautilus window is in foreground with a folder open showing the contents of the folder

2. Make sure this window is not maximized, and move it around so that, on the background, you can see your desktop, and specifically, an image file that is in your desktop. Remember, at this stage the Nautilus window with the folder is in the foreground, focused.

3. Click on some file within the nautilus window to select it.

4. Click on the desktop background. Then click on some file on the desktop. Then on another one. Then finally on one particular image file that you have in your desktop. Now the desktop has focus and something in it is selected.

NOTE: you can skip step 4, and you would observe the issue allthesame and it would still be bad. But the fact that explicitly including this step 4 you can observe the issue, makes it even more egregious.

5. Double ckick on the image file in the desktop, so as to open it in the default image viewer

Now the image viewer window is in the foreground.

6. Close the image viewer window

7. Hit the Delete key.

** EXPECTED **

After step 6, focus should return to the desktop, where the image file was selected. Hence, hitting the Delete key should delete it

** OBSERVED **

For some random nonsensical reason, after step 6, the Nautilus window with the folder is focused, and hence, when you hit the delete key you delete whatever file was selected in it.

This is a HUGE issue which may cause you to delete the wrong content without even realising it. And if you don't realise soon enough, you may be unable to undelete it.

Just one more of a gazillion bugs that make Nautilus not only unusable, but also DANGEROUS. One of the most essential components of a Desktop operating system and yet one of the most broken ones. Fucking pathetic.

I'm done with this crap, I will get rid of Ubuntu and install some other distro.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nautilus 1:3.18.4.is.3.14.3-0ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-179.209-generic 4.4.219
Uname: Linux 4.4.0-179-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Jun 6 15:45:50 2020
GsettingsChanges:
 b'org.gnome.nautilus.window-state' b'sidebar-width' b'192'
 b'org.gnome.nautilus.window-state' b'geometry' b"'1464x887+768+660'"
 b'org.gnome.nautilus.list-view' b'use-tree-view' b'true'
 b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
InstallationDate: Installed on 2013-10-11 (2429 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)