[ROOT] bBtchmode, DISPLAY and TGApplication

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Hi,

I found out, that if the DISPLAY variable is not correctly set my 
application crashes. Searching for the reason I realized, that in the 
main function gROOT is already set. From the constructor of the TROOT I 
learned, that Batch-mode is enabled if DISPLAY is not set. So I 
instantiate a TGApplication object afterwards, which sets the DISPLAY 
variable in case it is not yet set (calling gSystem->SetDisplay) before 
instantiating a TGClient object. Wouldn't it be a good idea to reset the 
batch mode in the case setting the display was successfull? Otherwise I 
have to reset it manually...

Best regards,
Thomas.

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