Improve the diff highlights

[sorin-patrasoiu]

There is a domino effect to consider when having diffs, which will result in too many elements being highlighted.
This needs to be improved with better strategy.
The xmldiff output (excluding RuntimeId and ProcessID:
UpdateAttrib(node='/Window[1]', name='height', value='490') UpdateAttrib(node='/Window/Window[1]', name='y', value='232') UpdateAttrib(node='/Window/Text[2]', name='Name', value='Your computer is protected only today') UpdateAttrib(node='/Window/Text[2]', name='height', value='64') UpdateAttrib(node='/Window/Text[3]', name='y', value='-443') UpdateAttrib(node='/Window/Button[1]', name='height', value='18') UpdateAttrib(node='/Window/Button[1]', name='y', value='349') UpdateAttrib(node='/Window/Button[2]', name='height', value='18') UpdateAttrib(node='/Window/Button[2]', name='y', value='349') UpdateAttrib(node='/Window/Text[10]', name='y', value='-443') UpdateAttrib(node='/Window/Button[3]', name='y', value='439') UpdateAttrib(node='/Window/Button[4]', name='y', value='439') UpdateAttrib(node='/Window/Button[5]', name='y', value='439') UpdateAttrib(node='/Window/Button[6]', name='y', value='439') UpdateAttrib(node='/Window/Window/Menu[1]', name='y', value='232') UpdateAttrib(node='/Window/Button[1]/Text[1]', name='height', value='18') UpdateAttrib(node='/Window/Button[1]/Text[1]', name='y', value='349') UpdateAttrib(node='/Window/Button[2]/Text[1]', name='height', value='18') UpdateAttrib(node='/Window/Button[2]/Text[1]', name='y', value='349') UpdateAttrib(node='/Window/Window/Menu/MenuItem[1]', name='Name', value='Recent event') UpdateAttrib(node='/Window/Window/Menu/MenuItem[1]', name='y', value='243') UpdateAttrib(node='/Window/Window/Menu/MenuItem[2]', name='y', value='278') UpdateAttrib(node='/Window/Window/Menu/MenuItem[3]', name='y', value='312') UpdateAttrib(node='/Window/Window/Menu/Separator[1]', name='y', value='347') UpdateAttrib(node='/Window/Window/Menu/MenuItem[4]', name='y', value='-443') UpdateAttrib(node='/Window/Window/Menu/MenuItem[5]', name='y', value='-443') UpdateAttrib(node='/Window/Window/Menu/MenuItem[6]', name='y', value='348') UpdateAttrib(node='/Window/Window/Menu/MenuItem[7]', name='y', value='383') UpdateAttrib(node='/Window/Window/Menu/MenuItem[1]/Text[1]', name='Name', value='Recent event') UpdateAttrib(node='/Window/Window/Menu/MenuItem[1]/Text[1]', name='y', value='251') UpdateAttrib(node='/Window/Window/Menu/MenuItem[2]/Text[1]', name='y', value='286') UpdateAttrib(node='/Window/Window/Menu/MenuItem[3]/Image[1]', name='y', value='323') UpdateAttrib(node='/Window/Window/Menu/MenuItem[3]/Text[1]', name='y', value='320') UpdateAttrib(node='/Window/Window/Menu/MenuItem[6]/Text[1]', name='y', value='356') UpdateAttrib(node='/Window/Window/Menu/MenuItem[7]/Text[1]', name='y', value='391')

The resulting image is: