Nemo ignores --no-desktop when switching displays

[Duncan Bayne]

I'm running:

Linux Mint 17 64-bit Cinnamon
Nemo 2.2.2
StumpWM "Debian Git checkout 1:20110819.gitca08e08-2.1"
xrandr 1.4.1

... on a Lenovo ThinkPad L520. Nemo, StumpWM and xrandr were all installed through apt-get from the Mint repos.

Repro steps:

1. log in using StumpWM as my window manager
2. plug in an external HDMI monitor, but leave it disabled
3. start Nemo with:

  nemo --no-desktop

4. observe that Nemo has not managed the desktop on the laptops LCD; this is as expected
5. enable the second monitor with the following script:

  #!/bin/bash

  set -e

  xrandr --output LVDS1 --off
  xrandr --output DP1 --off
  xrandr --output HDMI1 --auto
  xrandr --output LVDS1 --auto --left-of HDMI1

6. observe that Nemo *has* managed the desktop on the external monitor, disregarding the --no-desktop setting; this is not as expected

Worth noting is that if the second monitor is enabled before Nemo is launched with --no-desktop, it behaves correctly. This problem only occurs if Nemo, launched with --no-desktop, is already running when the new monitor is enabled.