distrobox-export --app misbehaves when distrobox name contains name of application

[yump]

If the name of the distrobox has the name of the application (example: "foo") as a substring, distrobox-export --app foo will create an extra .desktop file that attempts to re-enter the container from inside the container. Also, the intended export will have the wrong icon.

To Reproduce

Assemble from this ini:

[codium-test-fedora-39]
image=fedora:39
start_now=true
pre_init_hooks=dnf -y install dnf-plugins-core
pre_init_hooks=dnf config-manager --save --setopt=max_parallel_downloads=20
pre_init_hooks=rpmkeys --import https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/-/raw/master/pub.gpg
pre_init_hooks=printf '[gitlab.com_paulcarroty_vscodium_repo]\nname=download.vscodium.com\nbaseurl=https://download.vscodium.com/rpms/\nenabled=1\ngpgcheck=1\nrepo_gpgcheck=1\ngpgkey=https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/-/raw/master/pub.gpg\nmetadata_expire=1h\n' >/etc/yum.repos.d/vscodium.repo
additional_packages="codium"
exported_apps="codium"

Observe bogus .desktop launcher (the 2nd one):

> ls -1tr ~/.local/share/applications/*test-fedora-39*
/home/rhaley/.local/share/applications/codium-test-fedora-39.desktop
/home/rhaley/.local/share/applications/codium-test-fedora-39-codium-test-fedora-39.desktop
/home/rhaley/.local/share/applications/codium-test-fedora-39-codium-url-handler.desktop
/home/rhaley/.local/share/applications/codium-test-fedora-39-codium.desktop

The exec line is:

Exec=/usr/bin/distrobox-enter  -n codium-test-fedora-39 -- /bin/sh -l -c  /usr/bin/distrobox enter  codium-test-fedora-39

And the launcher for codium uses the icon for fedora:

> grep -i icon ~/.local/share/applications/codium-test-fedora-39-codium.desktop
Icon=/run/host/home/rhaley/.local/share/icons/fedora.png
Icon=/run/host/home/rhaley/.local/share/icons/fedora.png

Expected behavior

If distrobox is instead called cod1um-test-fedora-39, there are only 3 .desktop files, and codium has the correct icon:

> ls -1tr ~/.local/share/applications/*test-fedora-39*
/home/rhaley/.local/share/applications/cod1um-test-fedora-39.desktop
/home/rhaley/.local/share/applications/cod1um-test-fedora-39-codium-url-handler.desktop
/home/rhaley/.local/share/applications/cod1um-test-fedora-39-codium.desktop

> grep -i icon ~/.local/share/applications/cod1um-test-fedora-39-codium.desktop
Icon=vscodium
Icon=vscodium

Logs

I commented out the export from the .ini and manually ran distrobox-export --app --verbose, resulting in this export.log

Desktop (please complete the following information):

Host: Fedora 39
distrobox: 1.6.0.1 from dnf
podman: 4.8.1

Additional context

If I'm reading the code correctly, there's a filter that's supposed to prevent this, but it doesn't seem to be working.