Public bug reported:

 * Nemo version 4.8.6
 * Windowed Nemo
 * Distribution - Ubuntu MATE 21.04 (Alpha/Beta), installed Ubuntu Cinnamon 
Remix 21.04 environment
 * Intel i5-7200U CPU, Intel HD Graphics 620 GPU
 * 64 bit

Issue
While working on an icon theme, and manually replacing images going through the 
folders, nemo crashes. I got this twice-one was a trap, another was a segfault.

Mar 31 16:21:35 Joshua-PC kernel: [  574.248846] nemo[5129]: segfault at 5de ip 
00007f0ab9562c60 sp 00007ffe4068fe48 error 4 in 
libgobject-2.0.so.0.6705.0[7f0ab953b000+30000]
Mar 31 16:25:05 Joshua-PC kernel: [  784.271992] traps: nemo[7460] trap stack 
segment ip:7f9eaa572db7 sp:7ffceefa9f40 error:0 in 
libgtk-3.so.0.2404.21[7f9eaa1fc000+385000]

(above is two different crashes)

Steps to reproduce
It just happened, quickly. I can't get an exact thing, but this is the closest 
idea:

    Open nemo.. twice. Two different windows, two different directories
    Move icons from folder into the other folder in the different window. The 
images must have the same name and probably symlinked.
    Replace the images for all of them
    Whenever doing some action, like switching out of the window, or maybe 
Alt+Tabing or going to another folder by going back a directory, nemo will 
crash/trap.
    Hopefully a clear reason will be found for this on reproducing.

Expected behaviour
Nemo won't crash.

Other information
This is an Alpha/Beta build and I actually haven't updated the system yet.
No nemo extensions installed
syslog.txt - https://termbin.com/b8he
------------------------------------------------

See: https://github.com/linuxmint/nemo/issues/2717

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: nemo 4.8.6-1
ProcVersionSignature: Ubuntu 5.11.0-11.12-generic 5.11.0
Uname: Linux 5.11.0-11-generic x86_64
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Wed Mar 31 16:34:32 2021
InstallationDate: Installed on 2021-03-28 (3 days ago)
InstallationMedia: Ubuntu-MATE 21.04 "Hirsute Hippo" - Alpha amd64 (20210327)
RebootRequiredPkgs:
 linux-image-5.11.0-13-generic
 linux-base
SourcePackage: nemo
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug hirsute

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https://bugs.launchpad.net/bugs/1922129

Title:
  Nemo crashes/traps with quick image and window/directory(?) updates

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