ie10 permutation causing browser errors? (gwt 2.6.1) really baffled here.

If I want my GWT2.6.1 application to compile to ie10, this is correct isn't it;

<set-property name="user.agent" value="ie8,ie9,opera,gecko1_8,safari,ie10" />

?

Because my app is producing this bizarre error in ie10;

SEVERE: Exception caught: (TypeError) 

 description: Object doesn't support property or method 'replace'

 number: -2146827850

 stack: TypeError: Object doesn't support property or method 'replace'

   at $trim (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:45877:3)

   at $getZindex (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:8859:3)

   at $onLoad (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:8974:5)

   at $onLoad_0 (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:10025:3)

   at onLoad_2 (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:10453:3)

   at $onAttach (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:3021:3)

   at onAttach (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:3126:3)

   at execute_24 (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:41620:3)

   at tryCommand (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:41595:7)

   at doAttachChildren_0 (http://www.lostagain.nl/games/%5BThorn%5D%20Game/code/2A19E36B832C073830A38A4BA25AD56D.cache.html:4040:3)

 __gwt$exception: <skipped>: Object doesn't support property or method 'replace'com.google.gwt.user.client.ui.AttachDetachException: Exception caught: (TypeError) 

 description: Object doesn't support property or method 'replace'

Note the "trim()" - which I was astonished to learn recently wasn't supported on ie8.

Is this just a coincidence and the error lies elsewhere? or is somehow a ie8 permutation running in ie10?

Can anything else override what permutation is picked to run?

The application works fine on chrome, firefox and opera.

The problem is a bit more curious, however, as some trim statements do work.
Heres the code triggering the crash:

 SOLog.info("~~~~~Just before trimming");
 SOLog.info(""+GWT.getHostPageBaseURL().trim()); //displays the homepage url fine
       
 Element ParentElement = this.getElement().getParentElement();
 SOLog.info("Got parent E"); //displays
 Style ElementStyle = ParentElement.getStyle();
 SOLog.info("Got parent Style"); //displays
 String ZindexNonTrim = ElementStyle.getZIndex();
 SOLog.info("Got parent Zindex "+ZindexNonTrim); //reachs here fine. The zindex of the element happens to be 30 and that value displays in the log correctly
       
 SOLog.info(""+ZindexNonTrim.getClass().getName()); //this results in "java.lang.string"
       
 String blar = "30".trim();   //this trim works      
 SOLog.info("Well gosh darnit! "+blar);

 String zindexstring = ZindexNonTrim.trim(); //this one causes the crash <<<<<<<<<<<<<<
 SOLog.info("~~~~~zomg no crashyness?");

I just cant get my head around why a string.trim() is causing a crash when other string.trims() are not.

HELP!

;(

Appreciate anything,
Thomas Wrobel

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