External monitor connection changes desktop for some windows

What steps will reproduce the problem?
1. Opened a bunch of windows on desktop 1, including adobe acrobat X docs
2. Sent some pdfs to desktop 2, some to 3
3. Was on desktop 2, plugged in external monitor to my laptop (which is set to 
change resolution and become the only display)
4. At the time of connection, active window was a firefox window (windows of 
firefox were open on all desktops 1-4).  Upon connection, the taskbar 
repopulated.
5. Several pdf document windows copied from desktop 3 to 2
6. A thunderbird window possibly copied during this even from desktop 1 to 2

What is the expected output?
Resolution and monitor changes shouldn't bring windows to the active desktop.

What version of the product are you using? On what operating system?
1.6b3

Please provide any additional information below.
I couldn't detect any reason the windows that copied did their movement.  Some 
file titles had extra "."s, dashes, parentheses or underscores in the 
name/window title, while others did not.  One window remained only on desktop 
3. Desktops 1 and 4 don't have any PDF windows, nor did they before this event.

Window duplication was confirmed by changing position/highlighting in the 
document on desktop 3 (or in thunderbird's case desktop 1), taking it out of 
focus, switching to desktop 2 and finding it there.

I have two files with the same name (Stromatolites_Schopf-Tripathi.pdf) open on 
Desktop 2 - these are independent windows likely launched from different 
directories.  The only file that was not copied from Desktop 3 was 
"cyanoZDSj.1432-1033.1996.00115.x.pdf" - so lots of dots and dashes.  But 
"1-s2.0-S0198014910800196-main.pdf" was duplicated.

Other windowed applications did not duplicate windows across desktops during 
this event.  Open windowed applications are firefox, windows explorer 
directories, GIMP2, MarvinSketch, LibreOffice Impress & Writer, Skype.  
Impress, firefox and likely windows explorer had windows open on multiple 
desktops including 2 and 3.

Thunderbird has a single window open that currently shows on two desktops.  I'm 
not sure if it was duplicated in this event or something else that I did caused 
it to be displayed on both desktops (I WAS going back and forth between 
desktops 1 and 2 to read an e-mail on desktop 1 and at one point on desktop 2 I 
hit the quicklaunch button for thunderbird which opened the application on 
2...I'm not sure if I closed this window prior to the monitor plugin).  
Highlighting confirms that it's the same window on both desktops.
Original issue reported on code.google.com by fer...@gmail.com on 4 Apr 2012 at 12:46
Serghei123 / mdesktop

External monitor connection changes desktop for some windows #150
