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Sometimes I have seen questions with a ridiculous amount of trailing whitespace. This wouldn't bother me so much if the scrollbar wouldn't appear:

cout << "Hello World!" << endl;                                                                    

It might also be that the code is indented a lot and the trailing whitespace tips the scale:

 for(int i = 0; i < 10;i++)
          for(int j = 0; j < 10; j++)
                  thisVariableIWillIncrementAlsoILoveCamelcase += whyNotMultiply;      

It would be nice if when a language where whitespace doesn't matter is specified, trailing whitespace would be ignored.

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5  
If a mechanism can detect that, then I'd rather see an automatic downvote instead! ;-) (Seriously: we need to teach folks to put some effort in their questions.) –  Arjan Dec 5 '11 at 13:15
2  
What languages require egregious amounts of whitespace tacked on at the end of a line??? I mean, other than the Whitespace language. –  Won't Dec 5 '11 at 14:32
    
@Won't: Well, none that I know of, but it would be kind of wrong to mess with the whitespace if whitespace is meaningfull in the language. For instance if I posted some code, didn't mark it as any particular language and the question is something like "Why does my machine make a weird grinding noise when I try to parse this with obseleteParserâ„¢?" It just might be the case that the whitespace is significant, but when the prettifier thinks it is C++, it should be safe. In the rare (I haven't seen a single case of this yet) case where it is significant one can always add "language: lang-none". –  HaskellElephant Dec 5 '11 at 14:45
    
In addition of the automatic removal of trailing whitespace, I would also like to see the automatic removal of empty lines (when there is a block larger than one present) –  Veger Dec 20 '12 at 12:18
    
<irony>I have an almost overwhelming urge to remove the unnecessary whitespace in this question</irony> –  ZombieSheep Dec 20 '12 at 12:21
    
If you wanted any proof that this happens, here is a recent one: stackoverflow.com/posts/17427649/revisions –  HaskellElephant Jul 2 '13 at 14:10
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